Does anybody know how to tap in my stock fuel gauge , or run a auto meter aftermarket gauge, so I'm not guessing on how much fuel is left in the car ? Could I hook the stock ecu back up , and have it solely control the gauge cluster? The rest is all disconnected , ignition/fuel/sensors etc. I'm sure this would be a problem as the fuel gauge doesn't work until the ignition is switched too on. Any points or tips, on how to get here done the easiest?

 

Also the speedo, this is a m6 car

 

You can use the factory fbody sender and run new wires to your dash. You need the electronic programmable autometer fuel level gauge to use our backweird ohm range 270-30 or something. Actually saving up for that one now. It has presets to match fbody unit.

For a speedo, I'm running the Autometer with GPS. It doesn't give a crap what size tires or gears lol