Finally found the cause of my overheating

So, I did verify it was an electrical issue with the gauge, temp can get over 210F with high ambient temps and stop and go traffic. However, I started having more gremlins, and was "losing" 2V somewhere. It was three different circuits causing the voltage drop. I decided to stop "dic*ing" around and fix all of the underdash wiring. The engine harness was replaced last winter. Thanks for the help!