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TR2/3/3A Can a TR4A fuel gauge be used in a 3A?

trrdster2000

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Sure, just a couple of things. Do you have a voltage stabilizer or can you get one, it will read high otherwise and will look a little out of place, just use your convex lens and all will be fine.
I have a full set of gauges somewhere, I know the temp is broken, but could be a good buy for someone, they have the convex lenses.

Would not break the set for one gauge and surely there are a lot of them floating around.

Good luck. Wayne
 

TR3driver

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You'd have to use the 4A sender as well. The tr3 sender works backwards to the later ones.
 

trrdster2000

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Good point, I did not know that.
Could the wires be reversed at the gauge?

Wayne
 

TR3driver

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Wouldn't fix the problem. The TR3 sender gives a low resistance for empty, while the TR4A gauge will show full for a low resistance.

Basically, the gauge went from being magnetic to thermal when the TR4 was introduced.
 

trrdster2000

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That kind of takes care of the swop.
Karl, if you go the route and need a sending unit, I'm sure I have a couple, they do have the plastic floats with them. Seems like a lot of trouble, but you do what you have to, sometimes.

Wayne
 
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karls59tr

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I'm still in the process of finding out why the fuel gauge needle dosn't move when I turn on the ignition (1/2 tank of fuel) before I go the 4A gauge route but thanks for the sender offer. I might try the test that Randall posted recently to see if I can get the original to work. I put a new wiring harness in the 3 and everything works great but the fuel gauge. Haven't had a working fuel gauge for close to 20 years.lol
 

trrdster2000

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Understand, the '37 had its own stick with marks for how much. LOL

Wayne
 

6TTR3A

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90% of sidescreen fuel gauge problems are poor or nonresistant grounds. The factory provided the ground thru the fuel gauge attachment bracket, which seldom if ever was adequate. The fix is a dedicated ground. Clip a test lead to the fuel gauge stud, ground the other end anywhere. If it works, make it permanent. Also, a properly installed fuel tank is not grounded. Be sure there is a wire running from the tank sending unit to ground.
Frank
 
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