Thanks guys. A new temp. sending unit didn't change the reading. We did check the timing and it was a bit too far advanced but only a few degrees. The water pump is circulating well. But we hooked up an accessory temp. gauge and the temp. was exactly where it should have been. The gauge in the dash is not reading accurately. I don't know if the receiving unit in the dash can be replaced without replacing the whole gauge, but I think we'll just keep the accessory gauge and call it a day.

Gerry