Got my factory temp guage working..BUT....

[61_FL_Apache]

I was able to trace the original wire from the guage into taped up bundle of wires in the engine bay. I found the dark green wire for the temp sender and still had the original connection on the wire.

Yesterday I bought a temp sender for my year truck with a guage and not a light.

The issue Im having is the temp rises too fast on the guage. I have a mechanical aftermarket guage also. When that guage shows around 130, the factory guage is all the way to the right. It starts out on the left when cold, but it doesnt take long to sweep to the other side.

Do sending units have different ohm ratings like gas guages do?