The Ford Barn - View Single Post - 1950 239 flatheat water temperature sending units

tubman · 05-02-2022, 10:05 PM

First of all, you should know that Ford gauges do not use variable resistance. They operate on the "King-Seely" principle, which uses bi-metallic actuators in the sending unit that sends different pulses to the gauge that has a corresponding bi-metallic unit in the gauge that causes the gauge to register the reading.

A short search on the internet says the dual terminal gauge closes at 220 F. I would imagine that that it may vary between units, but it sounds about right.

05-02-2022, 10:05 PM	#2
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,316	Re: 1950 239 flatheat water temperature sending units First of all, you should know that Ford gauges do not use variable resistance. They operate on the "King-Seely" principle, which uses bi-metallic actuators in the sending unit that sends different pulses to the gauge that has a corresponding bi-metallic unit in the gauge that causes the gauge to register the reading. A short search on the internet says the dual terminal gauge closes at 220 F. I would imagine that that it may vary between units, but it sounds about right.