My name is Renard Thomas from France.
after long search on the web, I find this forum and I hinks your project is extra!
to view the status of the mechanics of my golf 1 tdi swap (mk3 tdi with mecanical pump), I want to install the same things of your "vr6 display"
the aims is to see the boost presure (1-1.5 bar), the oil pressure and temperature, the rpm (I think using the sensor on the
bottom of the engine "engine speed sender g28" ) the voltage and put a stopwatch who start when the wheel turn (it's a lot of
things but if it is playable).
my problem is I do not know which component to choose... Arduino is certainly appropriate and I dont know if I can use
the same program used for vr6... in my mk1 tdi-M, I have no ECU, it's like an electronic injection you spend a carburetor...
I thank you in advance for reading me and understand me, German is not my first language

If you have the time, my project is on the forum : http://fioul-engine.forumpro.fr/
friendly, Thomas