Convert 6 cyl tacho for use with 4 cyl

[grobbins]

I add a resistor in parallel (to an existing resistor) during the re-cal to
adapt the 2 rotor rotary tachs  (Mazda RX-7) for my V-8 conversions. The rotary
has similar pulses to a 4 cyl., so sensitivity needs to be decreased, in my
case. Your situation is the opposite, as you need to increase sensitivity. The
value of the cal-pot itself may need to be changed, probably to one of a higher
value.

Here is a link to a tach mod on a Toyota.
http://www.netzone.com/~jayk/tachmod.htm

Grant

Daniel Houlton wrote:

> Peter Gargano wrote:
> >
> >What's the best way to convert an analogue electronic tacho,
> >set up for a 6 cylinder, so it reads correctly for a 4 cylinder.
> >Assuming there is no access to the internal electronics, just the
> >external signal from the coil. (logically, the tacho requires 3
> >pulses for every two pulses the coil generates).
> >
>
> I've done this with an Isuzu instrument cluster.  The tach on
> that has a pot that you can adjust the tach with.  I just hooked
> up a multimeter that read rpm correctly and adjusted the pot in
> the tach to match.
>
> Your's may have the same kind of adjustability.
>
> --Dan
> houlster at inficad.com
> http://www.inficad.com/~houlster/amigo.htm
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