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No boost safety switch or similar on the NA, but IIRC it does also require a tach signal to trigger the relay. Other than the ignition switch failing, this is about the only failure that should likely fit your description (good work on the diagnostics, BTW).
So first I'd try hotwiring it at the ignition switch, see if that'll get the pump to run.
I forget which wire is the tach lead, but that'd be the next thing, to verify that it's got continuity to the coil/tach. I assume the tach jumps when you crank? I don't know for certain, but I don't think the NA has the same problematic DITC ignition that the 81-82 turbo does?
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Vaughan Scott
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http://www.924.org
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