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The stock map is 3 wires, the 3bar sensor is 4 wires. The 4th wire is pigtailed into the OBD2.
Analog reads right off vacuum or boost, visa tube (my case) or another sensor. To read boost,
I am told you need the 4 wire, 3bar Map. I have both with the 3bar map (OBD2 and analog).
With the P3gauge.
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