Gage Cluster Interchange - The 1947 - Present Chevrolet & GMC Truck Message Board Network

beaterC10 · 05-05-2006, 02:37 PM

I scored a reasonably priced tach cluster for my 86. The cluster itself is for an older truck since it has a mechanical oil pressure gage, voltmeter, and 100 mph speedometer. I also recently scored an 81-87 tach that works.

My plan was to use the 81-87 tach, my 86 speedo, and an 80 psi mechanical pressure gage I have in the older cluster. That would give me a cluster that has matching graphics and an oil pressure gage that doesn't peg.

Would this combination work? I know the speedos will interchange and I assume the tachs would also. I also assumed that if I remove the sender for the electric pressure gage that the wiring to the gage won't matter.

84 PUMPKIN · 05-05-2006, 05:34 PM

It's possible to mix and match speedos, tachs, and other gauges but you MUST use the correct printed circuit. Your '86 will require a '78 or newer printed circuit. If you use the '73-'75 printed circuit it will result in an instant fire. With the '76-'77 printed circuit you'll have a 50% chance of a fire and a 100% chance that it won't.

05-05-2006, 02:37 PM	#1
beaterC10 Senior Member Join Date: Jul 2003 Location: Indianapolis, IN Posts: 1,277	Gage Cluster Interchange I scored a reasonably priced tach cluster for my 86. The cluster itself is for an older truck since it has a mechanical oil pressure gage, voltmeter, and 100 mph speedometer. I also recently scored an 81-87 tach that works. My plan was to use the 81-87 tach, my 86 speedo, and an 80 psi mechanical pressure gage I have in the older cluster. That would give me a cluster that has matching graphics and an oil pressure gage that doesn't peg. Would this combination work? I know the speedos will interchange and I assume the tachs would also. I also assumed that if I remove the sender for the electric pressure gage that the wiring to the gage won't matter.

05-05-2006, 05:34 PM	#2
84 PUMPKIN Registered User Join Date: Oct 2004 Location: Alabama Posts: 166	Re: Gage Cluster Interchange It's possible to mix and match speedos, tachs, and other gauges but you MUST use the correct printed circuit. Your '86 will require a '78 or newer printed circuit. If you use the '73-'75 printed circuit it will result in an instant fire. With the '76-'77 printed circuit you'll have a 50% chance of a fire and a 100% chance that it won't.



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