Fuel tank installed

CRUZE 418 said

The lock ring that came with my SS tank from Van's worked fine. I tried a thicker lock ring on my old tank ( Mega Parts ) carries it, ramps are higher, could not even get it in. It might work on another brand steel tank, but not my old inconel steel tank. I tested mine for leakage before installing it in the car, also, they might not leak with a gallon or two, but would with 10 or 18 gallons of fuel weight .
What did you end up using for a sending unit/pick up?

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I have ten gallons in it now, I bought a sending unit 3/8" at Carlisle, old style with no vent tube, and checked it out on my old tank (with 1/4 tank of gas) and it seemed fine, but right now while running, the gauge is fluctuating between 1/2 tank and 3/4 with the ten gallons. My old one worked fine but it is 5/16" line. My old tank was plumbed into the bottom with 1/2" for a poor man's race tank. Doing away with that and change from 1/2" to 3/8" fuel line prompted the tank change (along with the fifty years of crud).