Seems like sound logical advice. Thank you.

I’m in the process of testing and replacing my fuel sending unit. The original sending unit measured 25 Ὡ’s whether it was full or empty on the test bench. Factory spec from what I can tell is 10 full and 73 empty. So instead of paying a crazy amount for an OEM sending unit I purchased an aftermarket from Z car. Upon testing that unit I had a reading 74 ohms full & 136.7 empty. The Ὡ’s difference between the Factory spec. and the aftermarket unit is 62.7 ohms, the same range. Does that mean I can use the aftermarket, or do I need test/calibrate with the actual Gage?

The Ohm's difference is to big is my first thought. I would strip the resistance wire off the new one and careful unwind the wire from the old one and put it up on the new unit in a way that the unscratched wire is not on the contact side of the strip.. hope you get what i mean. (The old wire will have some flat points and you don't want them near the contact that is gliding over it.)

What you also could do, take a ohm meter and take the new wire and measure yourself a part out of it that measures the right amount of ohm and put that on the new unit back!)

Lots of succes and... take your time, make strait nice coils!

Edited April 14Apr 14 by dutchzcarguy

Have you checked the ebay? I found a 1970-74 fuel sending unit with the stock resistance (10 - 73) for $15ish. The description said it was part number 25060-E4100. The part is not OEM.

Here is the label off the box:

Edited April 16Apr 16 by darom

I'm going to check now. Thank you.

I have a FREE fuel tank for someone.

Where are you?

San Jose CA