Pull the pinch fastener on bottom side of the sending unit off carefully with a small pocket screwdrive...slowly. You can reuse it. Under that is where your ohm's are losing contact and jumping around. Rust..oxidation and just crap build up under there. It will come out as a dust.. careful with the rubber washer as well.
Reassemble and check the ohms again and see if you did some good.
Good Luck.
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