Gas gauge only reads half when full

Hi everyone, I installed a new gas tank sender in my 63 after bench testing it and confirming ohm range on the bench.

However after installing and filling it up, it only reads half full after filling the tank up.

Is there a way to calibrate this? Does it involve bending the float arm? I'd hate to drop the tank again.

I've searched the forum high and low for this issue and haven't been able to find anything - just some dead links when referring to gas gauge calibration in this thread.

Thanks in advance!

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Permalink Reply by Russ Austin on February 18, 2026 at 10:10am

The gauge is out of calibration. I have gas gauges that I had calibrated at an electrical shop for 125.00

email me at russ@thecadishack.com if interested.

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