tachometer signal

[Jim Green]

--- Richard Hoffman <billzcat1 at hotmail.com> wrote:
> This isn't going to work for me as I have no
> distributor to take advantage
> of.

Um, what what are you doing again?

> So to be clear: the typ89 5-cyl tachometer uses a
> square wave, 2.5 pulses
> per revolution?  

Correct

> Or does it take an independant
> signal from the ECU?  What's
> going on here?  I don't have an occiliscope to check
> this stuff out :)

Nope, I've feed it from the dist, from a Haltech, I
think some of the Crane and Msd ign boxes have tach
outputs that would work, the 034 efi tack output works
great, and could be configured to make the tach think
there's 5 cyl there instead of 8 cyl if you did a v8
swap. You really just need the 5 pulses per engine
cycle to make it work right.  If you're not running a
5cyl, and you were previously, that could be tricky
with some management systems.  Who knows, there may be
some jumpers on the tach or something that might help,
I've never looked.

=====
Jim Green
'89 80q slow
'89 90tq fast, really fast
http://www.mswanson.com/~jgreen/car_home.html

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