My fix for this was relocating the sending unit to the fitting near the distributor.
As others have said, the current replacements are inferior to the originals and I believe exhaust manifold heat is what takes them out so quickly. I've got at least a couple thousand miles on without a failure in the new location.
Another problem with the last few I've used is they don't read accurately. I've read that an inline resistor solves this problem.
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1970 GTO-vert, 461, eheads, stump puller, m20, 3.42
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