My good experience with aftermarket sending unit! (1964 Plymouth B Body)

[Big Bad Dad]

I just finished replacing my tank and fuel pickup, etc. today. Working on my 1964 Fury. The tank and sending unit got crudded up and rusty from the darn ethanol gas I was dumb enough to leave in it for a few years... Anyway, I have read about how the aftermarket sending units for our Mopars are usually far from accurate. I replaced my tank with a stainless steel tank, and purchased a Spectra Premium FG129A pickup tube/sending unit. The new unit had a different shape at the pickup sock, and the sending unit float arm was much shorter than my original. (I did not take a picture of the new unit, but there are pictures of it on RockAuto.) I figured the gas gauge would be WAY off. However, I was relatively pleased with the readings. The new tank is listed as 15 gallon capacity. I found a source for 93 octane, non-ethanol gas locally. I went today and got 15 gallons in gas cans, as my car was still up on the stands in the garage. Decided to check the gauge as I filled the tank. I started with the tank dry, and checked the gauge. It read empty. Put in 2-1/2 gallons and it stayed on empty. At 5-14 gallons, it read 1/8 tank. at 7-1/2 gallons, it was just slightly above 1/2 tank. At 10 gallons, it read 3/4 tank. At 12-1/2 gallons, it read full. I went ahead and filed the tank up with the 15 gallons. I don't know how accurate the gas gauges really were in 1964, but figured this was going to work out fine for me with my car as it is only a part time toy. Now, I don't have to worry about running out of gas because I had no idea what was in the tank..
Picture is my original crusty sending unit. I pulled the float off, and found it was about half full.....