There should be a pressure sender on the MC itself, with 1 or 2 spades (signal, or signal & ground; depending whether it's an early or late model sender).
It should have one (signal) or both (signal & ground) wires connected, and a small reset pushbutton in the center of the sender. Sometimes they're easy to reach, but most of the time you have to lower the splash shield to get to it.
BTW: I went to your site (nice car) and was curious where you purchased the combo gauge conversion kit. Looks like something I might be interested in doing.
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