IO box options for Indicators/Oil Pressure

I’ve got the majority of my gauge cluster built and need to crest into the next issues.
This will be for a 2006 Ford Crown Victoria running gear and frame with a 72’ Ford F100 Cab/Bed.
I have all the gauges working less the oil pressure. I understand that in the mid 90’s Ford decided to use an oil pressure switch vs and actual pressure switch. So the gauge and idiot light both show ‘normal’ with anything over 6psi and is a direct wire between the switch and gauge (no OBD2). Also, the dash indicators for blinkers and hi/low beam are not on the can network (from what I can find) and may be on the SCP network instead. Due to this, is there a simple way to utilize both the OBD2 port for ‘most’ of the dash function and add in an arduino I/O box for the other inputs?
Alternatively, it would not be difficult to utilize a manual pressure gauge for oil and analogue LED lights flush mounted to the dash but I am really looking for a cleaner way to do this and implement them into RD. The entire idea I had utilizing RD was to have a sleek dash setup that implemented all of the needed items within the digital dash vs a bunch of add on gauges/lights for information.
I have researched the spleinonen boxes discussed in other threads but this product seems extremely overkill for the very few items I would need to implement.

I am still rather new to RD and am terrified of the canbus side of if the application so I have not done much research there due to not seeing any PID’s for items I am trying to implement.

Thanks in advance for any help you may have! This software is truly amazing and I cannot wait to fully finish my project and enjoy the flexibility it provides!

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RealDash does support any number of simultaneous connections, so possible; yes- many users do something like this.

Simple? It depends if working on Arduino a simple task your you. We do have some examples of how to send data from Arduino to RealDash here:

RealDash-extras/RealDash-CAN/Arduino-examples at master · janimm/RealDash-extras