temp. sender

You wouldn't truly know the temp of each individual bank, only that if the temp guage is working correctly that it's showing it's not running too hot and around the correct temp, you can put a temp thermometer in the radiator to get an accurate temperature reading, but again it would be basically a combined temp.

The only true way to get a temp bank individaually would be to install a mechanical temp guage for each bank the gauge would acctually show you the temp in degrees. I am not sure of the accuracy of these new digital/laser temp guns, and that possibly they would give you the reading for each bank by taking them seperately.

I am not possitive of all flatheads, but I believe a correct temp is around 180 dg.
 
As PeeWee said, the best thing to do is run 2 temp guages. I've done that to a few cars and they all seem to run a few degrees diffrant on each bank. Walt
 
You can run wires from two temp senders to a double throw toggle switch then to the gauge. The toggle is hidden under my dash....flip to the left reads the driver's side head and flipped to the right reads the passenger side. This way you have one gauge.....Matt in Alameda
 
My 1946 Ford pick up has two electrical temperature sending units wired in parallel, one for each bank. The temperature gauge measures the total heat for both sending units. All of the later flat head temperature senders are installed that way. My 1935 convertible sedan only has one mechanical temperature sender unit.
 
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