4" Tachometer | 10K RPM | Classic Design

SKU: L4-TC4-LEG
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$225.03 USD
Programmable tachometer compatible from 1/2 to 6 pulses per revolution, accepting tach signals over one volt for broad engine compatibility. Works across a wide range of ignition systems and setups for clean installation. Precision stepper motor ensures smooth, stable, and accurate RPM readings.
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Order leaves our facility in about 2 Weeks

The Classic Tachometer delivers clear, dependable RPM so you always know where your engine is. Programmable from 1/2 to 6 pulses per revolution and accepts signals over one volt, giving it the flexibility to work across a wide range of gasoline engines and ignition setups. From classic builds to modern swaps, it installs clean and works without the hassle. A precision stepper motor keeps the needle smooth and steady—no bounce, no guesswork—so you get accurate readings at a glance. Built with a durable housing and solid aluminum bezel, it’s made for real driving and long-term use. Made in the USA and backed for life.

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

Key Features:

  • Accurate RPM Monitoring — real-time engine speed tracking
  • Wide Engine Compatibility — supports 1–12 cylinder and ½–6 pulse signals
  • Flexible Signal Input — works with most ignition systems and setups
  • Microprocessor-Driven — real-time accuracy
  • Stepper Motor Precision — smooth, accurate pointer
  • Weather-Resistant Build — built for street, track, and off-road
  • Made in the USA — backed by a lifetime warranty
Download Instructions

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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