I am looking for some help. I have a 1994 Chevy K3500 Cheyenne with a 5.7L. approx 64,000 miles. Mileage is correct. It used to be a plow truck at work. Problem I am having is temp gauge on the dash reads approx 150 degrees after being warmed up and when I plug in the OBD1 tool it says the engine is around 195 degrees. I replaced the stat as I had issues getting the engine to warm up like it should. Found the stat was stuck open. Replaced the sensor between #1 and #3 cylinders after grounding the wire off the sensor and the temp gauge pegged. Looking for some help to fix this. The old sensor was reading low too. Guess I am down to wiring issue.....