[Mach 1]

The senser is on the firewall in both cases. On speed density cars, the sensor has a vacuum hose going to the upper intake manifold (usually to the bottom of the upper, close to the vacuum tree on the factory manifold) and a connector with a couple wires going to it. MAP = manifold absolute pressure


The Mass Air cars can use the same sensor, except the vacuum hose is removed and the vacuum port plugged on the manifold, and the vacuum port on the sensor where the vacuum hose used to go, now goes to outside air and the sensor just reads ambient or atmospheric pressure. BAP = barometric air pressure