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Product Description

  • Solid state (no moving parts)
  • Works with other conversions
  • Drives devices needing negative coil signal to function (like the vanagon tach)from ECU tach signal
  • Weatherproof, sealed plug/pigtail
  • Easy 4 wire hookup
  • Compact (about the size of an automotive relay)
  • Made in USA (by us!)


The stock vanagon tach (and many aftermarket tachs/devices) signal is taken from the negative terminal of a single ignition coil. Engine swaps that include more modern distributorless ignition systems do not have this kind of ignition. They use multiple coils, each with their own signal controlled by the ECU.

There are several methods of getting the vanagon tachometer (and ones like it) working after an engine conversion. The first method to get the vanagon tach working with this type of ignition is to use diodes on the coil wires, which allows the vanagon tach to read the combined signal without crossfiring the coils. However, this method can be very dangerous as the ECU was not designed for this and isn't protected from potential problems. A short to ground of the tach signal wire can cause damage to the coil drivers on the ECU resulting in a dead ECU. Another common method is to modify the tach itself to read the type of signal generated by the ECU. This involves removing the instrument cluster, removal of the tach itself, replacing components in the circuit, or sending the tach to someone else to modify. All of these complications and potential sources of problems are eliminated with the Tach signal converter. Simple 4 wire hookup makes it non-invasive, completely safe for the ECU, and entirely reversible.


(old style)

Red- switched or constant power

Black- Ground

Yellowtach signal from ECU (you could intercept the tach wire on the van side so you don't have to cut the bostig harness)

Greentach wire to the dash


(new style)

WHITE- Ground

BLACK- Tachometer Signal IN

RED- Tachometer Signal OUT

BLUE - Ignition Power


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Product Reviews

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  1. High Quality 5 Star Review

    Posted by on 24th Sep 2015

    I received my converter quickly and had it installed just as quick! Its a fantastic interface between the wiring in my Vanagon and my Subaru motor. Fantastic customer service and a great product...what more could you want!

  2. Simple and perfected 5 Star Review

    Posted by on 10th Jun 2015

    I just put a 1998 ALH into a vangon... this was the icing on the cake for the conversion. No issues installing, signal wire of ecu connected and power and we were good to go

  3. tach signal converter is good 5 Star Review

    Posted by on 18th Oct 2013

    I have bought these in the past for doing my 1.8t conversions in vanagons. Very nice product that does what it says and is easy to wire in.
    I have done Bostig conversions for my customers in the past and am very impressed by their company and quality. I am happy to support them even when doing other conversions.

    Andrew Flint
    Flint European Automotive

Tachometer Signal Converter

2.00 LBS
$7.50 (Fixed shipping cost)
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