Temperature gauge always hot?

Well I found a fellow here in Salem, Oregon, Wagers Ford Parts, that had an NOS 6V Sender. Put it in, turned the key and off to cold we went. I appreciate everyone's help. It was a weird.

Happy to have a temp gauge that now climbs as the car warms up.

Jim
 
I have a reproduction sending unit on mine so maybe time to look for a NOS sender,I put a NOS gauge in and it worked correctly the first time but back to the way it was before.
 
OK, I have been looking at all kind of info on 12V to 6V gauges for my 55 ford. My ford on 6V the temp gauge starts on H, start the engine, it drops to C, then swings toward H. To H indicating the engine is too hot. I have converted to 12V neg ground and used a high quality voltage reducer made for gauges. I reversed the connections at the back of both gauges. Fuel gauge works fine. The temp gauge still acts the same. I replaced the sensor with a sensor (that was new) that I removed from my 48 flathead. I have a new radiator, thermostat, high flow water pump & fan. Sensor ground is good. I have a IR gun and see nowhere on the engine or radiator that it is running too hot. What next, the gauge?
 
When my 55 had the original motor the temp gauge ran almost all the way to hot with a 180 thermostat and its the same way still,I do not think the gauge is very accurate.
 
Sounds like what I get out of this is watch the gauge and keep my IR gun handy. Replacing the gauge is around $80. Looks like that might be a bad waste of $$. I'll see if it bothers me too much. I really don't want to add under dash gauges that I have.
 
Read this linked article, it says that the oem '55 gauges are not voltage or polarity sensitive. It's due to the old-school way those gauges were built.
And, in most cases a voltage reducer is not needed.

The oem temp and fuel gauge parts are usually not all that compatible with newly made replacement style parts. The (pre '57) oem gauges and their sensors like to work as a pair, with original yr matching parts at both ends of the circuit.

https://www.ctci.org/gilsgarage/6to12.php

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