Tachometer and Speedometer Testing tool for classic GM vehicles

Was: $112.95
Now: $104.95
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1967-1992 Camaro, Firebird, Corvette, Fiero, Corvette, GM Trucks, and other 1960's to early 1990's GM vehicle - Tachometer and electronic Speedometer Tester - 3rd Edition

arrow.png See the Video tab for a couple short videos showing this tester in use, testing a speedometer and a tachometer.

You can never have too many good tools. Our popular tester is now on the 3rd edition (2021). This Digital Tester reproduces the signal type and frequency that replicates the signal that comes from the vehicle's tachometer and electronic speedometer signal sources.
Power Settings:
ON/OFF. Frequency settings: 1Hz-1000Hz. Includes frequency to RPM table. Works with 1-12 cylinder engines. Duty cycle adjustable.
A must have tool for testing and repair of late 1960's and early 1990's tachometers and electronic speedometers.

Fast and simple set-up - takes @ 1 minutes to set up and begin testing.

  1. Connect to power source.
  2. Connect Power, Ground, and Signal clamps to your tachometer or speedometer circuit board or gauge cluster plug or wire..
  3. Turn ON.
  4. Select Frequency.

This Digital Tester produces:
(1)  12 volts DC current to power the tachometer or speedometer.
(2)  Low current DC frequency adjustable pulsed signal - This provides the RPM or speed signal to the tachometer or speedometer.
(3)  Adjustable duty cycle.

Includes: (1) Digital Tester (2) 120 Volt AC Power Supply (3) Instructions

Product Note 1: This tester is compatible with tachometers that are driven by a circuit board. It is not compatible with tachometers that are simply a coil, such as early 1960's and earlier model year tachometers. It is also compatibly with many electronic speedometer's that use a pulsed signal to provide speed information to the speedometer.


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90 day Limited Warranty.

2 Reviews Hide Reviews Show Reviews

  • 4

    Posted by Ed on 28th Jan 2021

    The only Tach tester that I know of that can test it outside the car, works great. A dial would be better than buttons.

  • 5

    Posted by Verified Customer on 13th Sep 2019

    Works great. Easy to use. Great price.

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