Ken Williams wrote:
>
> Can anyone give me a quick lesson on wiring SV Alpine tachs? I have the
> Jaeger 4 cyl. electronic tach and a 1725 SV engine in my SIII. A wiring
> diagram would be sweet, but just some good directions would get me there.
> Also, is there any way to bench test the tach to see if it really does work?
> I've never had it hooked up, so there are no existing leads. Thanks in
> advance for any help.
>
> Ken Williams
> Austin, TX
> kenw(at)admin.stedwards.edu
> fax 512-416-5845
I'm not sure about a Jag tach, but the Alpine tach had a little plastic
piece with a bi-metal clip that house the assembly to the tach. The wire
runs from the ignition switch to the tach and wraps around the plastic
piece twice and then goes to the POSITIVE side of the coil. There is an
adjustment screw in the back of the tach you could use in conjunction
with a known good tach/dwell meter to calibrate it. I read that you
shoul adjust it around 3000 rpm to slit any error between lo and hi
RPMs. I think the only way to bench test it would be to have a function
genterator to pulse the tach input but you would need a scope to measure
the pulse in Hz and then convert it to RPM. I'm not even sure if that
would work! Haven't tried or though about it before. Any electrical
engineers out there with some advice?
There is a wiring diagran on the Alpine page. Here's the URL:
http://www.team.net/www/rootes/sunbeam/alpine/mk1-5/techtips/techtips.html
Sergio
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