I just swapped from TBI to a Holley 750 carb and my tach/speedo don't work. I'm fairly sure if I hook up the white wire (that currently splits at a grey connector) to the coil I'll get tach, but where's the signal from the speedo come from? Is it tach related and I'll get that back as well after hooking up the tach? Or is it tranny related and I should look there? Any help is appreciated,


Steve

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Steve's Trans Am Temple

 

If I remember correctly, the input from the speedo in the trans goes to a speedo buffer, then from there its to the computer and the speedometer. But, it might go from the speedo buffer to the computer and then to the speedometer, in which case it wont work since you've eliminated the computer. Check your Helm's manual for the diagram...

The tach I dont know, sorry...

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Steve, check in the 'tech' link in my sig; I have an article on installing an electric speedo and what you'll need to hook yours back up.
Your theory on the tach sounds good...it should work that way.

Pete

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Pete's Place
HiOutput Tech Page
83 SC
originally a V6...now
210+k mile LG4/5-speed
14.891@95.54
My karma ran over my dogma

 

I'll check it out and get back to ya...


Thanks,
Steve

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Steve's Trans Am Temple