TachMatch is a solution for making your tachometer work, when things just don't match up like they did at the factory.

Did you do an engine conversion? Maybe change the type of tachometer drive signal by installing a different ignition? Install an engine with more cylinders? You don't have to change your tachometer or instrument panel - you can install a TachMatch tachometer adapter into your car, truck or boat.

How TachMatch Works...

Tach Input:

The TachMatch TM-03 accepts most standard tachometer inputs. If you have a standard coil and points ignition, connect TachMatch to your coil. If you are using an aftermarket system to control the coil, such as an MSD, TachMatch accepts its tachometer output signal. If you have a typical GM HEI ignition, the HEI tachometer output signal drives TachMatch. If you are driving your tach from an ECU, the TachMatch allows you to configure an internal pull-up resistor for compatibility.

Cylinder Conversion:

If your tachometer is designed for a different number of cylinders than your engine, The TachMatch TM-03 can change the frequency appropriately to correctly drive your tachometer. By selecting how many cylinders your engine has (1-8), and how many cylinders your tach expects (1-8), a wide variety of ratios are available, anywhere from 1:8 ratio to an 8:1 ratio.

Tach Drive Output:

The TachMatch TM-03 sends the corrected signal to your tachometer. It can drive standard voltage-driven tachs, vintage tachs (such as older Stewart Warner, Radatron or Sun tachs), or if you have a current-driven tach, specify the TachMatch TM-03-I-Drive which also includes a power resistor. If you have a hard-to-drive voltage-driven tach, the TachMatch V-Boost provides a higher amplitude signal.

TachMatch Product Summary...

There are several TachMatch Products, all described below in more detail. Here's an overview to help decide which products apply to your application:

TachMatch Model Summary
Model Trigger Type Ratios Tachometer Type
  Coil MSD HEI ECU Cylinder-Count Conversion Standard Voltage-Driven Tach Current-Driven Tach Vintage Tach Hi-Volt Drive
TachMatch TM-03 X X X X X X   X  
TachMatch TM-03 I-Drive X X X X X X X X  
TachMatch V-Boost   X   X   X     X


TachMatch is connected via screw terminals on each module. Wire is not provided. An optional Wiring Kit is available if you do not have suitable wire readily available.

TachMatch products are shipped via priority mail. Please see TachMatch purchase information for purchase details and additional postage necessary when shipping out of the US.

For an excellent source of detailed information about Smiths, Jaeger and VDO tachometers, as well as late-model Ford and other instrumentation, visit the Accutach Co. site.

Standard TachMatch...

The TachMatch Model TM-03 is designed with computer-controlled internal circuitry housed in a plastic enclosure. A 4-pin terminal strip is used for connection of the wiring (wires not included, but can be purchased below). To help solve any installation problems, it includes diagnostic tools, such as a LED that indicates power and if it is being triggered, and a special test output that can ensure that it is connected properly to your tachometer by providing a 3,000 RPM signal. If you are driving a vintage tachometer, two potentiometers (fine and coarse) allow you to adjust the output to make your tach read properly.

The TachMatch will trigger from the coil, HEI tach signal, MSD tach signal, or from an ECU. If you are triggering from an ECU, it contains an internal pull-up resistor.

Here is more information about the TachMatch Model TM-03:

The standard TachMatch TM-03 drives most analog tachometers.

If you are not in the United States, please see the bottom of the page for information about international shipping.

TachMatch Model TM-03

$64.95 including priority mail shipping to US addresses (see below for international shipping adders).



TachMatch I-Drive for Current-Driven Tachs...

Some earlier vehicles (such as the early 70's Datsuns and Smiths/Jaeger tachs labeled as RVI on the face) use a current-driven tachometer instead of a voltage-driven tachometer. These types of tachometers can usually be identified by some loops of wire around the connections at the back of the tachometer (see an example here). It takes more current and different wiring to drive these tachometers than typical voltage-driven tachometers.

This unit is the same as the standard TachMatch TM-03, but in addition, it includes an external power resistor to sink the current necessary for current-driven tachs.

See the TachMatch TM-03 instruction manual above for details of installation.

If you are not in the United States, please see the bottom of the page for information about international shipping.

TachMatch Model TM-03 I-Drive

$74.95 including priority mail shipping to US addresses (see below for international shipping adders).


TachMatch Voltage Boost Module...

Most tachometers can be driven with a 12v pulse signal, such as that provided by the standard TachMatch and the MSD-6 series. However, some tachometers need a stronger signal that more closely replicates the signal generated by the coil.

The TachMatch V-Boost Module takes a lower level input signal, whether it be ECU output, MSD 6 tach output, or from a standard TachMatch TM-03, and generates a stronger signal to the tachometer, similar in function to the MSD 8920.

Another application is when you are changing from a coil-style ignition to a system that uses a ECU. Often, ECU's, with a 5-volt signal, will not drive tachometers designed to use a 12-volt (or higher) level signal. This unit will convert from the digital-level signal to one which will drive your tachometer, similar to the Auto Meter 9117.

The TachMatch Voltage Boost Module does not do cylinder conversion. If you need that, it needs to be driven from a TachMatch TM-03.

Details of it's connection can be found in the instruction manual below.

If you are not in the United States, please see the bottom of the page for information about international shipping.

Voltage Boost

TachMatch V-Boost Module (TachMatch V-Boost)

$49.95 including priority mail shipping to US addresses (see below for international shipping adders).



TachMatch Wiring Kit...

The TachMatch is installed with four external wires connected to an internal terminal strip (see Instruction Manual links for details). Wire size can range from #14 to #22. If you don't have wiring supplies readily available, the model WK-01 wiring kit consists of four 36"-long wires, one each of red, black, orange and white. Also included are four butt-connectors and two ring terminals.

Wire is high-quality, made in USA, 18-AWG stranded. Terminal style may vary from that shown in picture. This kit is only available with purchase of a TachMatch or MeterMatch, and does not add any shipping charges.


TachMatch Wiring Kit Model WK-01 $8.50


TachMatch Purchase Information...

Each TachMatch is designed and made in the USA. TachMatch can only be purchased on-line.    Sales tax is collected for sales within Washington State. See below for additional shipping charges for international shipments.

While TachMatch has been designed to accommodate a wide range of applications, everything that you might try to mix and match can't be anticipated. So if you find that it doesn't work in your application, TachMatch comes with a money back guarantee (see warranty for details). You become responsible for loss once delivered to a comnmon carrier by TechnoVersions LLC. See the instruction manual links above for details about the limited warranty provided.

Additional shipping charges for international orders...

Additional Shipping to Canada $19.00

Additional Shipping to Australia/UK/Europe $29.00