2-5/8" Tachometer | 6K RPM | Jeep CJ Design

SKU: L25-TC2-CJ
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$188.00 USD
Programmable tachometer compatible from 1/2 to 6 pulses per revolution, accepting tach signals over one volt for broad engine compatibility across classic CJ builds and modern swaps. Works with a wide range of ignition systems and setups for a clean install without extra hassle. Precision stepper motor ensures smooth, stable, and accurate RPM readings on the trail or on the road.
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Jeep CJ Tachometer gives you a clear read on engine RPM so you can stay in the power band through climbs, crawling, backroad miles, and long days on the trail. Programmable from 1/2 to 6 pulses per revolution and accepting tach signals over one volt, it works across a wide range of gasoline engines and ignition setups—from original CJ powerplants to modern engine swaps. That flexibility makes it easier to build a clean, functional dash without extra hassle. A precision stepper motor keeps the needle smooth and steady—no bounce, no guesswork—so RPM is easy to read at a glance when conditions get rough. Built with a durable housing and solid aluminum bezel, it’s made for rough trails, changing weather, and long-term use in a Jeep that actually gets driven. Made in the USA and backed for life.

Track-Tested. USA-Built. Backed for Life.

Key Features:

  • Programmable Input — supports 1/2 to 6 pulses per revolution
  • Broad Signal Compatibility — accepts tach signals over one volt
  • Jeep CJ-Specific Design — made to match classic CJ interiors and trail-ready builds
  • Microprocessor-Driven — real-time accuracy
  • Stepper Motor Precision — smooth, accurate pointer
  • Weather-Resistant Build — built for street, trail, and off-road
  • Made in the USA — backed by a lifetime warranty
Download Instructions

We recommend hooking up your diesel tachometer to either the alternator R or W terminal, crank sensor signal, or magnetic pulse sensor.

  1. To calibrate it, while hold the button down start the engine. The pointer to move to 1k rpm when in calibration
  2. Next, move the pointer to where your idle is by holding the button down. If you release and hold down again, it will move the other direction.
  3. Release the button, and after a few seconds the pointer will go to 0 and then current rpm.
  4. Your calibration is done! It is permanently stored in memory.
  5. This can be done multiple times if needed.

To get into PPR (Pulses Per Revolution) calibration, you will press and hold the button down while power the gauge on (or menu button if you have 2 on the front)

You will determine your PPR based on the chart below. While in calibration, pressing and releasing the button will cycle through the options. 

After 5 seconds, the gauge will exit calibration and save the PPR the pointer is currently on, return to 0 then show the RPM reading.

If you have a dual speedometer + tachometer, then you will set the calibration on the screen display instead, holding button down while powering on, press and release button to cycle through menu options, hold the button for 3-4 seconds to select "Set pulses per rev" menu option, then press and release to increase PPR. The PPR will save after 5 seconds of inactivity.

Tachometer calibration
Engine ConfigurationDistributor-Based
(Single-Coil)		Wasted-Spark
(Distributorless / Coil Packs)		Coil-On-Plug
(COP)		OEM ECU
Connection		Aftermarket ECU
Connection
12 Cyl (4-Stroke)6 PPR1 PPR0.5 PPR2 PPR6 PPR
10 Cyl (4-Stroke)5 PPR1 PPR0.5 PPR2 PPR5 PPR
8 Cyl (4-Stroke)4 PPR1 PPR0.5 PPR2 PPR4 PPR
6 Cyl (4-Stroke)3 PPR1 PPR0.5 PPR2 PPR3 PPR
4 Cyl (4-Stroke)2 PPR1 PPR0.5 PPR2 PPR2 PPR
2 Cyl (4-Stroke)1 PPR1 PPR0.5 PPR2 PPR1 PPR
1 Cyl (4-Stroke)0.5 PPR1 PPR0.5 PPR2 PPR0.5 PPR
3 Cyl (2-Stroke)3 PPR3 or 6 PPR1 PPR3 or 6 PPR3 or 6 PPR
2 Cyl (2-Stroke)2 PPR2 PPR1 PPR2 PPR2 PPR
1 Cyl (2-Stroke)1 PPR2 PPR1 PPR1 PPR1 PPR

Calibrating single gauge tachometer:

Built to last. Backed for life.
  • Lifetime warranty on internal circuit board electronics
  • 5-year coverage on sensors and wiring
  • Applies to gauges purchased since Jan. 1, 2006

Every Speedhut gauge includes a lifetime warranty* on the electronic circuit board inside the gauge case. It is the core of the gauge — the part responsible for the precision communication that delivers the accuracy and performance Speedhut is known for.

Sensors, wiring, and other external components are covered by an unlimited 5-year warranty.

This combined lifetime / 5-year warranty applies to the original purchaser.
*For your lifetime — as long as you own the gauge — we stand behind it.
Speedhut Inc warrants products to be free from defects in materials or workmanship. This warranty is limited to repair or replacement. Speedhut Inc is not responsible for incidental or consequential damages. Improper use, installation, or unauthorized modifications void this warranty.

You need to connect the tachometer to the vehicle's ignition system, or ECU tach output if applicable. Exactly where you connect to will depend on your vehicle's fuel delivery system. The PPR (Pulses Per Revolution) calibration will also vary based on where your signal is and how many cylinders your engine is.

If you have a single coil distributor, you will connect the signal to the negative coil terminal.

If you have a coil pack or coil on plug, you will connect to any trigger wire. (The wire that will be a different color from coil to coil)

If you have an OEM ECU, you will likely need a 4.7 KiloOhm pull up resistor tied to 12v to help strengthen the signal.

Please view the diagram below for more information on how to connect a Speedhut Tachometer to an LS ECU.

How do I connect a Tachometer to a GM LS1-LS7 engine’s ECU? Setup the Tachometer to run 2 pulses per rev when connecting it to the engines' ECU.

Setup the Tachometer to run 2 pulses per rev when connecting it to the engines' ECU.

If your tachometer is constantly jumping around, it is likely electrical interference. You can try shielding the signal wire with aluminum foil or foil tape and tie each end to ground, it is pretty common as the components the signal wire ties to tend to be electrically noisy.

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