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I replaced that this morning with a new mechanical gauge and now it reads accurately. And while pulling a grade... And sitting at the stop light... Problem solved, problem staying solved. On to other projects. Thanis for the advice and have a great weekend.

My electrical gauge shows this while cruising on the highway.

I think I am because it will hold a constant temperature while driving. The gauge IS giving me a false temperature so I have to fix that first.

Maybe but I don't think so. I replaced it with a mechanical gauge. I'll drive it to work this week and report back.

Well... I replaced the sensor this morning and then drove to work. No change. I replaced the gauge this afternoon and drove to the bar. It reads a little hotter. I picked up a mechanical gauge at the part store and will install it tomorrow.

A 180 degree thermostat begins to open within three degrees of 180, so 177 to 183. By 200 degrees, the thermostat is fully opened. The operation of the thermostat, open to close, is a range of about 20 degrees, so with different temp ratings, you can fine-tune the run temp of your vehicle...

It is a 180 degree thermostat. It is installed correctly. The gauge isn't giving me an accurate reading so I'll begin with replacing the sending unit since I have one in the garage. I do appreciate all the advice.

Thanks Rich. You are correct. My gauge is showing 20+ degrees above actual engine temp. I have another sending unit I'll install. If that doesn't work I guess I'll go back to mechanical.

My 1985 M1028 is running a little hot, 220-240 range. I recently installeda new radiator (4 row) and hoses. I installed an electric temperature gauge where the dummy light sensor was. I installed a new 180 degree thermostat and it continues to run 220-240. I'm considering a 160 degree...