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| | | | Joined: Apr 2008 Posts: 136 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2008 Posts: 136 | The motor in my 58 is a 54 -55 235 from a car with a pg.
The port in the head for the temp sending unit (gauge)is 3/8" npt.
The 58 motor was 1/2" npt. I found a ford guage temp sending unit that was 1/4". I bushed it to 3/8" and hooked it up.
Cold the needle starts at half way and as the motor warms up it goes off the the scale.
I am thinking if I get a resistor I can make it read lower. Maybe a light bulg in series would confirm this?
I am wondering if there is an electricial guru that can tell me where to start size wise if I where to buy a resistor?
I could not find a TS unit that was 3/8 npt for a guage
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