FAST307009SensorsThese sensors, by monitoring intake manifold vacuum, measure the amount of load being placed on the engine. The MAP sensors relay engine load output to the ECU, which in turn adjusts fueling for optimum performance and economy.FAST MAP sensors, by monitoring intake manifold vacuum, measure the amount of load being placed on the engine. They relay engine load output to the ECU, which in turn adjusts fueling for optimum performance and economy. Choose between 1-bar, 2-bar, 3-bar, and 5-bar MAP sensors.