89 d50 5apeed 4x4 temp gauge wiring

Hey everyone I am new to Mitsubishi and here. I bought a 89 dodge d50 5speed 4x4. 4 banger but I need to know what engine is in here. I believe it's the 2.6 4g54 but not sure. I have a wiring issue as well, my temp gauge doesn't work so I'm in need of a diagram. I'm in south AZ and I can't find anything for this truck. If you have the wiring harness for sell let me know but Im just looking for a diagram