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Here's the story: I bought a new sending unit from BPNW as I was having issues with the gauge needle swinging all the way to full even if the tank was not full. I installed the the sender and I believe I connected the wiring correctly. I added a ground wire at the gauge from the hold down bracket to a dash wing nut. When the ignition key is turned on ,but the car is not running the gauge needle goes to half way. When the car is running the needle tends to move to full. The thing is I do not see any B or T markings on the gauge terminals to be sure I have the green wire and Gr/BLK wires connected properly?? I believe I have the sending unit installed and wired properly. I did own a 4A parts car for awhile and I suppose I may have at some point swapped that gauge in the 3 not knowing at the time that they function differently. Can anyone take a look at the photos and let me know if this
is a 3 or 4A gauge and how to determine which are the correct terminals to connect the green (ignition switch) and Gr/BK to ground?
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TR2/3/3A TR3 Fuel Gauge or maybe it's a 4A ?????
- Thread starter karls59tr
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That sure looks the same as the one in my 4. The glass should be curved on a 3 and flat on a 4, but then I suppose the glass could have been swapped over. I also seem to recall the needle being longer and thinner on a 3, but It’s been a long time.
As far as the leads go, I remember when converting these cars from positive to negative ground, the only change (other than at the battery) was to swap the wires on the fuel gauge. Just swap the wires until the gauge reads full when it’s truly full, and you’re good to go.
As far as the leads go, I remember when converting these cars from positive to negative ground, the only change (other than at the battery) was to swap the wires on the fuel gauge. Just swap the wires until the gauge reads full when it’s truly full, and you’re good to go.
Yes I installed this TR4 gauge in my TR3 years ago and forgot that I had done so. Unfortunately I have now installed a new TR3 sending unit that I got from BPNW. I now remember reading that the two gauges function differently? Wasn't there something about putting a resistor inline on the green( power) wire to make it work?? Is there a workaround that I can do to make a TR4 gauge work with a TR3 sending unit? I hope.
Guess I have two options....switch to a TR4 sending unit and add a resistor or switch to a TR3 gauge if I can find one for a reasonable price. Karl