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DIYAutoTune.com part# GM3bar-map
Standard GM style 3-bar MAP Sensor (Manifold Absolute Pressure Sensor), compatible with all flavors of the MegaSquirt EMS as well as the MicroSquirt EMS. We've changed suppliers - these are assembled in the USA, unlike the current Delphi production.
Calibration is linear with 1.1 kPa at 0 volts and 315.5 kPa at 5 volts.
Note this is just for the sensor, the wiring harness connector is sold separately.
The new USA-assembled sensor uses a universal keying that is compatible with pigtails for 1, 2, and 3 bar MAP sensors. Older sensors used a specific keying: