That is the knock sensor
Yes
the regulator is located in the throttle housing (where the fuel lines connect)
On the drivers side corner of the cylinder head.
install a new one!!
It is located just above the oil filter (located in front of engine under exhaust manifold)
The manifold absolute pressure sensor on a 1989 Firebird Formula is attached to the passenger side fire wall just above and to the right of the air conditioner evaporator housing. There is a three wire plug and a single vacuum line connected to the bottom.
The one for the ecm is located next to the thermostat housing. The one for the gauge should be located between #3 and #5 spark plug on drivers side.
That year did not have a cam sensor.
That year did not have a crank sensor.
The 1989 Chevrolet 350 cubic inch engine coolant sensor is located on the front of the engine. The coolant sensor will be near the thermostat housing.
it is located in the fuel tank