Re: Tachometer Help?!!

[steveb@newkla.kla.com (Steven Buchholz)]

> I want to add an RPM warning light to my 86 4kq autox race car.  I have 
> learned that aftermarket tachs with lights and a tell tale are not made 
> for the 5 cylinder motor.
> 
> The idea I had was to use 2 LEDs from radio shack and attach them to 
> the tach.  One would light under a preset RPM (4000) and the other 
> would light over another preset RPM (6500).  Any ideas on how to do 
> this or if it is possible?  I would mount the LEDs inside my helmet and 
> connect via a cord.  Kinda like my own HUD.  I think it will help me 
> and, more importantly, psych-out the competition ;-)
> 
A friend and former colleague created a circuit that added a tattletale 
to a tachometer.  When the first message (I think it was Jeff G.) came
through I copied it to him.  He just got back to me and said that he 
would fire the schematics back to me when he found them ... apparently
he never took the project through to making a product.  I think that
we should be able to turn this into a 5-cyl tach with limits and 
tattletale.  I'll keep the list posted on developments as they occur.

Any requests regarding packaging or gauge style, etc.?

Steve Buchholz
s_buchho@kla.com
San Jose, CA