Tachometer with hourmeter for Detroit Diesel or Cummins engine -mechanical RH 1:2 3500rpm (3 1/2" diameter). This mechanical tachometer is designed for the most heavy duty marine, industrial and automotive applications.  With black background, chrome rim and white needle you will find your Detroit Diesel or Cummins engine rpm reading to be extremely clear. Each mechanical tachometer comes with a 100% money back guarantee and will ship direct to you within 24hr worldwide.

Detroit Diesel: Use this tachometer when:

1.- The reading is taken from blower and the tachometer is remote mounted on your instrument panel ( Blower to engine RPM ratio is 2 to 1).

2.- The reading is taken from the accessory drive gear and the tachometer is remote mounted on your instrument panel ( Accessory drive gear to engine RPM ratio is 2 to 1).

3.- The reading is taken from the camshaft gear and the tachometer is remote mounted o your instrument panel.  Camshaft of engine RPM ha a ratio of 1 to 1.  In this case you must use a tachometer angle drive with a 1 to 2 ratio to obtain the correct engine RPM.

Cummins: Use this tachometer when:

- The reading is taking from the injection pump.

- For engines: NH855, NT855, 4B 3.9, 4BT 3.9, 4BTA 3.9, 6B 5.9, 6BT 5.9, 6BTA 5.9, L10, M11, N14.

See Product Installation Instructions 1

See Product Installation Instructions 2