I have Cobra Classic ( AM ) gauges and the fule gauge reads full with an empty tank. Could it be as easy as the wires need to be switched ? One is black and one is yellow. I assumed the black was the ground
I know I saw this on one of the 3 cobra forums I look at sometime in the last week or so.
Seems like a guy said that the Auto-Meter classic fuel guage wasn't calibrated for the Ford sender. He called up Auto-Meter and they swapped the internals of one of their Ultra-Lite series fuel gauges into his Classic housing, and it worked for him.
Had a similar problem with an Auto Meter Fuel gauge. Switching wires is not the answer. The gauge is looking for a certain resistance at full and a certain resistance at empty. Auto Meter switched the guts of the gauge with parts that would work with my donor sender. They were extremely helpful. My '89 donor sender needs a gauge that reads empty at 16 ohms and full at 158 ohms. If you cannot get your gauge calibrated to match your sender, you may need to find a sender to match your gauge.
If you got the gauge from somewhere other than FFR you have the wrong gauge. FFR has already made the switch(had AM do it) for the late model sender. All the factory aftermarket gauges use a GM baseline and if you don't specifically ask for it, it will come that way. They should take care of it. There are 3 basic senders GM early Ford and Late Ford. Be specific when asking for the gauges.
Hope this helps. Cheers Richard.
The AM sender is a universal piece that replaces the stock sender. It requires measuring the depth of the tank and using a chart to determine the length of the mounting bracket and the float arm. It requires drilling five holes in the area around the stock sender hole. it is really a very easy task and the AM sender appears to be better made than the stock unit from Ford. The hardest part of the installation was removing the stock locking ring.
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