finding the tach wire

[GPdriver1986]

I'm not sure but I think I found the tach wire, I know its supposed to be white and by the DIS, but I see two white wires. I found the two white wires in the wire loom that run right by the DIS. Does anyone have a picture of the wire? After I find the tach wire where do I have to connect it (on the cluster)?

[god910]

We always used the ground to a coil. Can't tell you what it is though. Whatch out, big helper here.

[Robby1870]

Well, you are right it is a white wire, but when I hooked mine up, I had to guess at which one was it, and I guess right the first time. Also, the orange wire that comes from the ALDL connector is a tach wire too, if you want to splice into that

 

Robby

[Whiskey River]

As I'm not real familiar with the GP's, you'll have to excuse me. If you are installing an aftermarket tach, then I'm not real sure where you would tap into. The DIS has two white wires, as you have already found out. On the cars with analog tachs installed, the white wire next to the purple wire is the tach wire. The other white wire is a tach signal for the ECM. Hope this helps determine which white wire you need to splice into.

[GnatGoSplat]

The orange ALDL wire ONLY supplies a tach signal to digital clusters manufactured by Nippon Denso. I think this is ONLY the Cutlass and Regal digital gauges clusters.

 

All other clusters need the white tach wire, including Grand Prix half analog/digital clusters because they are made by Delco.

[GPdriver1986]

As I'm not real familiar with the GP's, you'll have to excuse me. If you are installing an aftermarket tach, then I'm not real sure where you would tap into. The DIS has two white wires, as you have already found out. On the cars with analog tachs installed, the white wire next to the purple wire is the tach wire. The other white wire is a tach signal for the ECM. Hope this helps determine which white wire you need to splice into.

_________________

 

So which white wire do I tap into?

[Whiskey River]

It will be the white wire closest to the purple wire.

[GPdriver1986]

So then I have to somehow bring it inside the car?

[Whiskey River]

When I ran mine for my tach, I ran it through the wire loom around to the right of the motor then through the grommet above the steering column. That allowed me to run it up through my dash and into the connector for my tach.