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I totally whiffed on the pot test in post #4. Back to the drawing board. My pressure gage is wonky. Been meaning to replace it. I'll tear into this one to see what's happening on the board.

You've done what I did, and are left with the same questions I have. My theory is the gage is set up as a qtr bridge circuit, which can be highly sensitive to milliohm variations - which most DVMs won't pick up.

It definitely doesn't act as a switch. Put the sender on a test rig and increment the applied pressure and the gauge will move accordingly. As best as I can tell, the gauge electronics are just very sensitive to very small resistance changes. I've seen several LS swaps that use an adapter to...