Removing the instrument cluster may be the easiest way to find it, Dark green wire, then backtrack from temp gage. The sending unit on the engine provides resistance to ground. If you take connector loose, touch wire to ground, key on, the gage should start moving. If it works, something wrong with sending unit.
Wiring info below, holler if you have any questions.
Thursday, March 10th, 2011 AT 5:02 PM