I'm not sure I understand exactly what you're asking, but I'll take a stab at it: Sounds like you need to dump the stock tach. It is known for being inaccurate (as are the rest of the factory gauges) Pick up a name brand tach, if you're a good fab person, you can build a new dash piece and fit the new tach and almost make it look factory. If you need the rest of the gauges, they are available in a kit.
The key to getting a good tach signal, is getting a clean signal. This potentially means shielding the wire, changing ground points, changing connections and connectors, etc. The MegaSquirt forum has a fair amount of information on correcting tach signal issues (MegaSquirt is very similar to SDS, so they have common "challenges" to overcome, though MegaSquirt has a larger knowledge base I think) If you're having problems with the rest of your gauges, then perhaps you really need to focus on their grounds and ensure they are all working properly and then work on their signal connections as well. Hope this helps, Stefan -------------- Original message ---------------------- From: Dave Krulitsky <[EMAIL PROTECTED]> > I went to my first event of the year and had an issue. My tach spins as high > as > it can go in my 86 GLHT. My EGT and Air/fuel gauges also calved. Made it > hard > to shift accurately, which was a problem, because I have a SDS (simple > digital > systems) installed. It is programmed to dump extra fuel in @ 5500 rpm as a > method of rev control. My GLHT is a heavily modified 2.5 running 21 psi in > race > trim. I am going to up the rev control to 6000. Any ideas would be > appreciated. > > Thanks, > Dave Krulitsky > 1986 GLHT > 2.5 etc. ___________REMOVE-FOOTER-WHEN-REPLYING_________ ShelbyDodge mailing list ShelbyDodge@imagilist.com http://www.imagilist.com/mailman/listinfo/shelbydodge
