Temp. sending unit-location

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38 Conv

38 Conv

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On a 46-48 Ford flathead, does it take 1 or 2-temperature sending units--I have one installed on driver side with screw--does one go in passenger side location and also heater hose locations supply-return---I have (4)-1/2'' plugs installed in head,front and back of radiator hose top outlet, which is in center of head---heads marked-59 AB-Thanks
 
It uses two. The single terminal one is a temp sensor. It goes in the right(pass) head. The two terminal is a normally closed switch that will open at 206°F. That one is in the left(drivers) head.
 
If your not going for originality, you can put a temp sensor sending units in each head and run the wiring thru a single pole double throw switch to the guage. That way you can read the exact temp on either side by switching the guage to read from each sender.
 
Heres a print:


Jim
366793367.jpg
 
I have a 47 Ford, and I also have the single sender on the driver side and double post on passenger side? Do you know for sure if the double post goes on the driver side on a 47 and would it make any difference in the temp reading?
 
peewee2you said:
I have a 47 Ford, and I also have the single sender on the driver side and double post on passenger side? Do you know for sure if the double post goes on the driver side on a 47 and would it make any difference in the temp reading?
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So long as it's wired correctly it dosn't matter which side it's on and it won't effect the temp' readings.
 
If you are using a 2 terminal sending unit, the wire from the gauge should go to it first. The 2 terminal unit is just a switch that is either closed (under 212 degrees) or open (above 212 degrees). The single terminal sender regulates the current flow in the circuit according to the temperature. When cold, there is more current flow than when hot. The current flow determine the needle position on the gauge.
 
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