It's not really impossible speed displays are usually just a communication wire and or simple inputs but you're right and I'm aware that you can't just connect anything you want....thus the question I'm trying to learn.
I am reviewing the wiring on my JRAHK controller (generic chinese controller) and a generic display.
It has 3 different wires for speed display with not much information about them and I was wondering if anyone can shed some light on what they are or differences
1) Speed display wire...