Murphy Tachometers

Driven ByAlternatorMag Pick UpAlternatorMag Pick UpEither
Rev Range0-4000 RPM0-4000 RPM0-4000 RPM0-4000 RPM0-66,000 RPM
Mounting Hole86mm86mm86mm86mm86mm
Voltage11-28 VDC11-28 VDC11-28 VDC11-28 VDC8-40 VDC

*Digital Tachometer with Overspeed



The AT Series tachometer is a rugged instrument with solid-state circuitry for indication of engine RPM.

It is equipped with a ring nut for mounting into a standard 3-3/8 in. (86 mm) dash mounting hole. A full 240° sweep of the pointer gives an accurate indication on a large easy–to–read scale, and the dial can be illuminated for night reading. The ATH Series model is also equipped with hourmeter to record the elapsed running time of an engine.


  • Improved quality
  • New, easy one-button calibration procedure
  • Every model will accept all signal sources: alternator, magnetic pickup or ignition
  • Easy ring clamp for installation
  • LED backlight