97 Chevy tach not working

[Delmo]

Hello everyone looking for a little help. Have 97 Chevy k1500 5.7l with 157,*** miles. The rpm gage is not working. The signal wire from coil (center white) was cut in half by someone in the past. When I try to hook it up. The truck dies immediately. I ckd voltage on the side coming out of coil and I’m reading 13.5. This will decrease when accelerator is increased to 13.2 volts. I replaced the plug it was in pretty bad shape. Also went ahead and replaced coil. Same results. Truck runs good as long as you don’t try hook the wire up. Thanks in advance for any help.

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[Caman96]

Check this thread out.

Tach Signal wire ????

So my tach (after market) does funny stuff when it gets to around 2500rpms, bounces all over. The gauge maker says I need a filter for it. Ok sure, Ill try that, but in looking at videos that say the white wire coming off the grey connector on the coil which is an empty wire, is the wire to tap...

www.gmt400.com

 

[Delmo]

Check this thread out.

Tach Signal wire ????

So my tach (after market) does funny stuff when it gets to around 2500rpms, bounces all over. The gauge maker says I need a filter for it. Ok sure, Ill try that, but in looking at videos that say the white wire coming off the grey connector on the coil which is an empty wire, is the wire to tap...

www.gmt400.com

Thanks for the reply, I don’t know if I can go off that post it looks like that coil is on a 95 and earlier. What was interesting in the post if not grounded you can read higher volts. I went ahead pulled the cluster to see if there was any arcing or damage. Found the signal wire on the connector that goes into cluster and it looks ok. Would like to know if anyone has checked voltage on a 97 tach signal wire and what they are showing for voltage. I’m beginning to think this is a ground wire issue.