Hi everyone, I had a 89 dodge cummins that I wrecked. I then found a 1992 without an engine, transmission, and transfer case. So I put mine in. I am now having ele trical problems. My grid heater doesn't turn on, the speedometer doesn't stay on, the temp gauge goes all the way to hot after the engine warms up, and the fuel gauge bounces around a bunch. Is this caused by a bad computer?? Also should I switch out the gauge cluster from the 89-92 and what would doing so entail of??

Thanks