71 Duster 360 turbo build

Yes. Gauge on the FPR set to 60 static, pulls to 50ish at idle, and 1:1 rise with boost.

0-5 sensor. Again, it reads correctly in the garage with the pump running and motor off.

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A real head scratcher. Seems you have your bases covered. What’s different between motor off and motor running from the ECU’s standpoint? Do you maybe turn on the 2nd pump only when above a certain RPM?