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[T3] pressure sensor help needed


Can someone (Jim??) please tell me which is the proper
manifold pressure sensor for my '68 square?
Mine came with two:

#1) Bosch 0 280 100 007 , VW 311 906 051 C
#2) Bosch 0 280 100 001 , VW 311 906 051 B

I know it must match the computer, which is
a "B" brain: 0 280 000 001 / 311 906 021 B

My hunch is that #2 is the correct one, but the car
doesn't run well on this.  The adjustment screw has
obviously been tampered with.
Is there a way to find the proper setting?

The car runs very well on #1 but only if I adjust the
fuel pressure reg to 18-20 psi, otherwise it runs too
rich. Timing and vacuum hoses are OK and voltage
regulator reads ~14.5 V.  I'm happy with the
performance this way, but being so far out of spec
makes me nervous something esle is wrong.

Thanks fellas,
Todd

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