> I got a tach from a six cylinder Jag and fitted it to my V8 LandRover.
> Basically if the tach you use was meant for fewer cylinders than you
> have, then the job is easy - all you have to do is decrease the current
> getting to the meter. You can be clever and reduce the pulse width or
> voltage, or you can be sneaky and just bleed off some of the current
> meant for the meter.
>
> I did the latter with a resistor in parallel with the meter coil. I
> set it up with a pulse generator, but you could do it in the car
> against a known tach. The linearity of the good quality tach was
> appalling before and after modification. Having found the correct
> resistor value with a pot, solder in a fixed value.
>
> Happy Revving,
>
> Best Regards,
> Steve.
>
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