What a great find this thread is. anyway
Ive been kicking around the idea of having physical gauges on my sim racing rig and there are some examples online and videos on youtube. Ive placed an order for some Arduino's and MCP2515 boards. Figuring i would have to sniff the bus on my 86 for a bit to find out how to control the gauge cluster outside of the car.
I don't have a lot to contribute at this point, but would like to.
here are some of the video's Ive been using to get started with CanBus comms, He goes way out of scope but its nice to see that data that can be pulled.
Part 1
Part 2
Part 3
I hope to have some data for you in the future.