# Use custom mupping not work

**URL:** <https://forum.realdash.net/t/use-custom-mupping-not-work/9036>\
**Category:** Bugs and troubleshooting\
**Created:** [September 28, 2025, 6:48pm UTC](https://forum.realdash.net/t/use-custom-mupping-not-work/9036 "2025-09-28T18:48:02Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![CoTECH](https://forum.realdash.net/user_avatar/forum.realdash.net/cotech/32/8_2.png) [@CoTECH](https://forum.realdash.net/u/CoTECH)\
**Post date:** [September 28, 2025, 6:48pm UTC](https://forum.realdash.net/t/use-custom-mupping-not-work/9036/1 "2025-09-28T18:48:02Z")

</div>

Hi. I searched this forum for information, maybe I couldn’t find it. It seems that “custom mapping” cannot be made to work. I created my own variable “MOD\_RPM” via xml and passed the engine speed to it. I put it next to the regular ID37 variable so that I could see the difference. I have changed the “custom mapping” parameters for my variable in the application. but it gives me unchanged data, as if custom mapping was not enabled. Please explain how to work with it, I’ve tried both terminal and interpolation, nothing helps.

---

<div class="post-metadata">

**Author:** ![CoTECH](https://forum.realdash.net/user_avatar/forum.realdash.net/cotech/32/8_2.png) [@CoTECH](https://forum.realdash.net/u/CoTECH)\
**Post date:** [September 30, 2025, 7:54pm UTC](https://forum.realdash.net/t/use-custom-mupping-not-work/9036/2 "2025-09-30T19:54:05Z")

</div>

The problem is solved.