If I apply vacuum to the pressure sensor, and measure pins 7&15 and 8&10 on the ECU cable harness, should the readings change when vacuum is applied? I mean that is what the device does, isn't it? Or is it no that simple.

Case in point 89 ohms 7&15 15 inches of vacuum applied and the reading stays the same. 356 ohms on 8&10 another 15 inches and reading stays the same.

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