# Haltech oil and fuel pressure In-accurate

**URL:** <https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468>\
**Category:** Bugs and troubleshooting\
**Created:** [May 20, 2024, 12:30am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468 "2024-05-20T00:30:48Z")\
**Posts on this page:** 19\
**Page:** 1

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**Author:** ![Franks14](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/43a26b/32.png) [@Franks14](https://forum.realdash.net/u/Franks14)\
**Post date:** [May 20, 2024, 12:30am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/1 "2024-05-20T00:30:48Z")

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Hi, I’m having an issue with the oil and fuel pressure values

I managed to get the values to read fairly close to the haltech but it’s still a 3-8 psi off, and when at zero pressure, real dash reads 10psi.

What’s the best way to fix this ?

Thanks !

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**Author:** ![realdashdev](https://forum.realdash.net/user_avatar/forum.realdash.net/realdashdev/32/6_2.png) [@realdashdev](https://forum.realdash.net/u/realdashdev)\
**Post date:** [May 20, 2024, 6:24am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/2 "2024-05-20T06:24:38Z")

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> [@Franks14](#):
>
> I managed to get the values to read fairly close

Did you make changes to connection XML for this? Please share your changes in order to analyze.

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**Author:** ![Franks14](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/43a26b/32.png) [@Franks14](https://forum.realdash.net/u/Franks14)\
**Post date:** [May 20, 2024, 7:32am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/3 "2024-05-20T07:32:06Z")

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Yeh I did, I changed it from Kpa to psi and moved the decimal point in the equation from 0.1 to 0.01

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**Author:** ![realdashdev](https://forum.realdash.net/user_avatar/forum.realdash.net/realdashdev/32/6_2.png) [@realdashdev](https://forum.realdash.net/u/realdashdev)\
**Post date:** [May 20, 2024, 8:10am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/4 "2024-05-20T08:10:32Z")

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But I believe Haltech sends pressure values in Kpa which is converted to Bar in XML:

```auto
      <value targetId="202" units="bar" offset="0" length="2" conversion="V*0.001"></value> <!-- fuel pressure -->
      <value targetId="151" units="bar" offset="2" length="2" conversion="V*0.001"></value> <!-- oil pressure -->

```

Conversion to bar allows user to use ‘Settings-\>Units & Values’ to change the display format of the pressure, as RealDash internally handles everything in metric units and units conversion is done at display phase.

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**Author:** ![Franks14](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/43a26b/32.png) [@Franks14](https://forum.realdash.net/u/Franks14)\
**Post date:** [May 20, 2024, 8:50am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/5 "2024-05-20T08:50:53Z")

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Oh cool I’ll give that a shot thanks !

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<div class="post-metadata">

**Author:** ![Franks14](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/43a26b/32.png) [@Franks14](https://forum.realdash.net/u/Franks14)\
**Post date:** [May 24, 2024, 6:58am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/6 "2024-05-24T06:58:17Z")

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The gauges are still off. Is there any other way I can adjust the accuracy?  
Thanks

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<div class="post-metadata">

**Author:** ![realdashdev](https://forum.realdash.net/user_avatar/forum.realdash.net/realdashdev/32/6_2.png) [@realdashdev](https://forum.realdash.net/u/realdashdev)\
**Post date:** [May 24, 2024, 10:44am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/7 "2024-05-24T10:44:39Z")

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When you say “off”, what do you mean? What is the displayed value, and what should it display?

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<div class="post-metadata">

**Author:** ![Franks14](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/43a26b/32.png) [@Franks14](https://forum.realdash.net/u/Franks14)\
**Post date:** [May 24, 2024, 11:37am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/8 "2024-05-24T11:37:03Z")

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Comparing to the haltech, at 0psi real dash is at 14psi. At 40 psi real dash is at 45-50psi

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**Author:** ![Jayz-1](https://forum.realdash.net/letter_avatar_proxy/v4/letter/j/65b543/32.png) [@Jayz-1](https://forum.realdash.net/u/Jayz-1)\
**Post date:** [May 26, 2024, 10:27pm UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/9 "2024-05-26T22:27:52Z")

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This is what I have in my xml for the oil pressure with a Haltech.  
Being that you are ~14psi or 1 bar I assume you need to add the -101.3

> value targetId=“151” units=“Bar” offset=“2” length=“2” conversion=“((V/10)-101.3)/100” rangeMin=“0” rangeMax=“150”\> \<!-- Engine Oil Pressure –

I don’t know how to put up code but if you cut and paste the above you need to add the \< in front of value and \> at the end of the –

Jason

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<div class="post-metadata">

**Author:** ![Franks14](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/43a26b/32.png) [@Franks14](https://forum.realdash.net/u/Franks14)\
**Post date:** [May 30, 2024, 12:19pm UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/12 "2024-05-30T12:19:15Z")

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Thanks ! That fixed the issue!

Can you please share what your line of code looks like for wideband overall ?

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<div class="post-metadata">

**Author:** ![Jayz-1](https://forum.realdash.net/letter_avatar_proxy/v4/letter/j/65b543/32.png) [@Jayz-1](https://forum.realdash.net/u/Jayz-1)\
**Post date:** [June 2, 2024, 10:25pm UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/13 "2024-06-02T22:25:35Z")

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I don’t believe I used wideband overall as I only have the one wideband. this is the code I used:

 ![image](https://forum.realdash.net/uploads/default/original/2X/d/d00acc5b7e95f7e703b7b17266c1f09013cb46da.png)

This is the code for wideband overall, I’m not sure I’ve tested it, but I cant see why it wouldn’t work.

 ![image](https://forum.realdash.net/uploads/default/original/2X/1/1408f4c855ca02b0a6e39e2a05acd36a57f61e3a.png)

These are both displayed in Lambda, but you could change the conversion to show in AFR if you wanted to.

Regards  
Jason

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<div class="post-metadata">

**Author:** ![realdashdev](https://forum.realdash.net/user_avatar/forum.realdash.net/realdashdev/32/6_2.png) [@realdashdev](https://forum.realdash.net/u/realdashdev)\
**Post date:** [June 3, 2024, 5:46am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/14 "2024-06-03T05:46:06Z")

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> [@Jayz-1](#):
>
> but you could change the conversion to show in AFR

Actually, if RealDash reads Lambda from ECU it will automatically set the AFR inputs and vice versa.

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<div class="post-metadata">

**Author:** ![Franks14](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/43a26b/32.png) [@Franks14](https://forum.realdash.net/u/Franks14)\
**Post date:** [June 3, 2024, 7:59am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/15 "2024-06-03T07:59:02Z")

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Thanks everything is working as it should now !! Well worth the effort.

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<div class="post-metadata">

**Author:** ![FrazUK13](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/34f0e0/32.png) [@FrazUK13](https://forum.realdash.net/u/FrazUK13)\
**Post date:** [October 11, 2025, 12:11pm UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/16 "2025-10-11T12:11:25Z")

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Is there a way of doing this in guage math? I’m having difficulty uploading an XML file due to layer version of Android.

Many thanks.

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<div class="post-metadata">

**Author:** ![realdashdev](https://forum.realdash.net/user_avatar/forum.realdash.net/realdashdev/32/6_2.png) [@realdashdev](https://forum.realdash.net/u/realdashdev)\
**Post date:** [October 15, 2025, 7:25am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/17 "2025-10-15T07:25:02Z")

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> [@FrazUK13](#):
>
> I’m having difficulty uploading an XML file

Install a file manager, that should solve this issue.

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<div class="post-metadata">

**Author:** ![FrazUK13](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/34f0e0/32.png) [@FrazUK13](https://forum.realdash.net/u/FrazUK13)\
**Post date:** [October 15, 2025, 8:34am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/18 "2025-10-15T08:34:17Z")

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I have done. Used Amaze and it let’s me select the file no problem. Its after that now I’m getting a failed to parse error.

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<div class="post-metadata">

**Author:** ![realdashdev](https://forum.realdash.net/user_avatar/forum.realdash.net/realdashdev/32/6_2.png) [@realdashdev](https://forum.realdash.net/u/realdashdev)\
**Post date:** [October 21, 2025, 10:21am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/19 "2025-10-21T10:21:24Z")

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There is probably some sort of a syntax error in your XML file. Use a code editor to check that file is correct.

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<div class="post-metadata">

**Author:** ![FrazUK13](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/34f0e0/32.png) [@FrazUK13](https://forum.realdash.net/u/FrazUK13)\
**Post date:** [October 21, 2025, 10:36am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/20 "2025-10-21T10:36:51Z")

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Ah OK. Just ran it through a checker there and you are correct many thanks. Will try it again.

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<div class="post-metadata">

**Author:** ![FrazUK13](https://forum.realdash.net/letter_avatar_proxy/v4/letter/f/34f0e0/32.png) [@FrazUK13](https://forum.realdash.net/u/FrazUK13)\
**Post date:** [October 22, 2025, 11:50am UTC](https://forum.realdash.net/t/haltech-oil-and-fuel-pressure-in-accurate/5468/21 "2025-10-22T11:50:33Z")

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This turned out to be the text I copied above uses different quotation marks. it has to be " and not “. Such a minor thing but that is the reason it didnt like the code.