1. test the gauge needle is working within range by unplugging the gauge sensor (single blade connector) and grounding the plug to simulate full hot. the needle should rise all the way up to red hot, if its not high enough then the needle needs reshifting on the shaft. its just held by friction so move the needle up till it stops then push it abit more by the extra amount needed to be in the correct working range.
2. take out the gauge sensor and test its within spec
3. if they're both fine, then the thermostats stuck open
I grounded the wire that comes from the gauge sensor. Its a single orange wire. when i grounded it nutin happened. The needle didnt budge. What else can i try. Thanks