Boost gage and tach. off please help

[BABY BOEING]

Since I purchased my car about 5 years ago my tach and boost guage have been way off. It neaver really bothered me to much untill I installed a shift light and it's off as well. It's a proform shift light and I cut the brown wire as it instucted for a 6 cyl. The tach signal wire is pluged in by the alt. on the green pig tail and I have to set it to 7000 rpm's to get it come on at 5000. I kinda figured the problem has to be in either the computer or module. If some one has had any experience with this please let me know. Thanks Jon.

 

[BABY BOEING]

hasn't anybody experenced this before?

 

[wlaukaitis]

Apparently that is what happens over time. When I first got my car ('86) they were both way off, I had to change the engine wiring harness and it seems the boost is somewhat on the mark. This makes me wonder about the wiring and connections being old/corroded and effecting the precision.

www.casperselectronics.com

they can sell you a "recalibrated" tach and boost gauge for $90 with a useable exchange. It seems they have changed thier site so I was unable to find it.

What part of my alarm was tapped into the white wire of the CCCI?

There is some talk about a green connector (I am not sure about this because there is also the fuel pump connector too) behind the alternator that can be used as a tech tap.

 

[BABY BOEING]

Thanks for the reply. I understand that the factory gages may be off due to age but why would the tach lead read high? I figured it had to be either computer or module related. As far as behind the alt. I use the one with for my trigger on my hotwire fuel pump and the other green conector with the 2 wires going to it as the tach leed. Does anybody know if thier is a differnet location to grab a tach signal? Thanks Jon

 

[Wicked]

Check out Caspers, he can fix your tach and boost gage.
You only need to send him the module section that is on the gage cluster.