I have a water temperature gauge that is not working. on 1991 Ford F-250

The oil pressure and battery volt meter gauge work fine. I was told that these gauges are all on the same fuse. The heater works fine so I don't think its a bad thermastate. Any advice would be very helpful Thank You

Asked by for the 1991 Ford F-250
Check the coolant temperature sending unit on the engine, it might be unplugged or defective. You didnt say which engine is in your truck. If its a 4.9 6 cyl its near the last intake plenum runner, if its a V-8 its on the left side of the intake manifold near the distributor.
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hello sailboater, i would replace that CTS so you can be aware of your engine temperatures...