Cummins Tach Sensor Wiring

Hi all i have a cummins 6bta with an alternator driven vdo 4 tach.

Cummins tach sensor wiring. The swaphelper is an electronic signal conditioning device. T urn key ìonî ó tachometer pointer should move to ìzeroî. Provide a smooth reliable tachometer signal to your cummins converted truck. The tachometer is intermittent random.

My 1997 dodge ram with it s 12 valve cummins diesel engine has had a strange intermittent problem that s gotten worse. If not check wiring. I installed a faria unit actually 2 and got no reading. By utilizing the oem dodge cummins tachometer sensor whether cam or crankshaft position respectively the swaphelper then provides the correct signal to the receiving truck s ecm.

I measured about 3v ac at the signal wire. Cummins will sell the sensor but they don t have wiring diagrams available. You have to keep the cam sensor and the crank sensor wires seperated until you get to the sensor then wire them together if you run them together they will pick up signals from each other and cause problems the shielding on the wires is crap i think you can wrap one in aluminum foil but that is a pain and doesn t look very good. There appear to be 2 harnesses red black wires in 1 green white in the other.

Calibration and adjustment the tachometer is factory calibrated to 3 full scale accuracy. It fits a x 16 tpi threaded hole and is used to sense the passage of gear teeth. Provision has been made for finer adjustment if. Model 8912 is a dual output four wire magnetic sensor.

The original is no longer available. Start engine and check gauge for proper operation of tachometer. Tach needle bumps when i switch on the key but no rpm reading. 8912 flywheel gear sensor dual output x 16tpi 2 1 2 long.

I am replacing the tach because it will intermittently stop working.