Donor Tachometer in 5G Cluster

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Introduction
A tachometer is a nice instrument that has a variety of uses. However, my car didn't come with one and I was lucky to find one from another model of the Mitsubishi Mirage that has a tachometer and auto transmission PRNDL lights. However, the tachometer isn't compatible with my engine and the needle whips erratically through its range. This is a known issue, confirmed by the dealer.

Although the tachometer signal from my engine can be analysed with an oscilloscope and fixed with some sort of a wave converted, I chose another inexpensive alternative. It involves connected the guts of an universal aftermarket tachometer to the faceplate of my tachometer. Sounds easy? Don't bet on it.


Starting Setup

Here's my 4g15 cluster with no tach, a 4g93 tached cluster and a Sunpro Super tach II.


The modification steps are:

  • Split the Sunpro tach motor and PCB to make it fit inside the new cluster
  • Adapt the Sunpro tach to drive the stock tachometer dial and needle
  • Move the speedometer from the old car to the new one to preserve the mileage


Tachometer Options

If you haven't noticed yet, the sunpro tach shares some crucial similarities with the stock one - it ranges from 0 to 8000 rpm and the range starts at about 8 o'clock and ends at 4 o'clock for about a 140° fan. The 4000 rpm 12 o'clock mark is off by a couple of hundred rpms and in the end the tach will show less than on the sunpro dial. But that is ok, because the engine overreports (or the sunpro overreads) the rpms, for e.g. I hit the rev-limiter at 72-7300 rpms but the specs say it's at 6800 or less. So this reduction in displayed rpms is ok.

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