1989 atari

can't find the right color code for the tach feed coming thru the firewall, i scraped up the dash trying to take it apart, i put it back when i remember it was too much of a pain in the behind

Do you have the Helm Factory Service Manual? If not, get it.

Seriously... many of your wiring related questions will be answered by that book... and if you are doing ANY THING electrical with these cars.

And if you can't fully understand it, we can help with that, and those with the same manual can direct you to pages.

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i will take your advice to heart, meanwhile all i need is a down and dirty answer, and i am sure some of you have done it before me.

i have located a link to a lTx car with the c100 connector, which i have found but they mention the tach and power lead G1 and G2.


I found the connector and the and the G2 and G! but the colors were wrong I think i am close, I really don't want to open the dash to tee into the tach nor tee into the distributor and run a wire through the firewall when one is already there.

someone has got to have done this and a simple pink, black or whatever would do the trick.

I'll make it simple just tell me in the picture below which is the tach wire and I would be eternally indebted...


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i suppose i could put a meter on the distributor and the wires and call it a day....duh or rather tommarrow

Tach wire on my 85 is white. I'm sure yours is too, just look on the distributor.

I had two white wire coming through the firewall plug, the thinner guage one was the tach.

Check it for continuity from the connector at the distributor. I put some alligator clips on my voltmeter for jobs like this where I can't reach both ends of the circuit.

thanks sir...

i saw two white and one thicker than the other, the wire before and off of the filter is white...

will the filter bother the performance of the light?

what is the filter for? i heard in some cases it works against aftermarket tachs...

again thanks!!

It was pin E1 on Connector C100 on mine.

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from my picture i counted over 5 which is E and row one is the bottom, and the wire is white...

i may take a risk and just splice without checking

thanks for all the confirmation.

Excellent!

I don't know the dash harness on the 89 to make any suggestions. I do have the 87 manual, but these cars changed just a lot too much from year to year.

Oh, to get a Helm, you can go to the source, www.helminc.com or head to eBay. they pop up there from time to time.

Considering the level of work you are doing, I am surprised you haven't needed it yet. That must be a testament to your skills and our abilities to answer! Either way, the book is an invaluable reference.

I've had some issues with my tach not registering above 4,000 rpms.

Never had a problem before the light install. May be a coincidence, or a bad connection or bad filter.

I soldered the tach light in though and have total confidence in the parts I worked on at least. Who makes that light?

I installed a Raptor shift light in my A/C vent.

too hot here in LA to impair a vent with a light, but i got it in and it works....



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on a test run...

the tach reads 3800 and the light reads 4400-4500

i am not revving it fast just holding it slow, which is right and which is wrong...

I know oem tachs are inaccurate, but what is the remedy?

Do you have the shiftlight programmed for 8 cylinders or 6?

The factory tach lags and can take awhile to catch up to actual engine speed, but if you're holding it steady then I'd question the tach light vs. GM's electronics.

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Actually the Raptor light is only about 3/4" diameter, A/C works great.

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i follow the instruction they had 2 wires in a loop, and clipping one or both with configure it for a 4 or 6 cylinder

I left them alone....as the default is 8cyl

heck i think i was holding steady , well not really just slow accelerating...

i fault the stock tack, i trigger the rev limiter once again, testing this stuff, i set that at 6225, and gas on at 5997 rpm

the stock tack is woefully inadequate.

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the glowshift i got for 29.99 shipped, didn't pony up for a raptor

in the future i will lengthen the wires to the pot and mount it somewhere, encase the circuit board and mount it behind the dash or hidden somewhere and put a multi led somewhere on the bezel, front and center

I can mess around with the rpms until i get the car dyno'd whereas the other without the pot, is set...

meanwhile the clunker sits atop the column, not too shabby....

I guess if you trust your speedometer you can do a road test try backing into the RPMS by calculation, see if it matches up with the tach or shift light. That's too big of a difference to head to the drag strip with.