Standard guage to tach swap-78 chevy - The 1947 - Present Chevrolet & GMC Truck Message Board Network

6772fan · 12-02-2009, 10:27 PM

I bought a tach gauge cluster from BigJake on the board. It's from a 79 Blazer. The truck that it is going into is a 78 Chevy with standard gauges with electrical oil pressure switch.
Question- Is this a direct plug and play or does it require wiring modifications at the connector under the dash? The tach cluster comes with the tach wiring harness. Thanks.

Jonboy · 12-02-2009, 10:52 PM

The tach wiring harness is seperate from teh cluster harness. It will have 3 wires (IIRC), and plug in to the tach only. You may have to repin the cluster wiring. If you can get the pigtail from the donor, it will make everything a lot easier. The colors will be the same, but may be in different locations. You will probably have to swap temp and oil senders as well.

ghettoluxury · 12-02-2009, 11:02 PM

trace the circit board on both clusters and see if they are the same if so you are good 2 go if not re-pin to match

12-02-2009, 10:27 PM	#1
6772fan Active Member Join Date: Jan 2004 Location: East Texas Posts: 380	Standard guage to tach swap-78 chevy I bought a tach gauge cluster from BigJake on the board. It's from a 79 Blazer. The truck that it is going into is a 78 Chevy with standard gauges with electrical oil pressure switch. Question- Is this a direct plug and play or does it require wiring modifications at the connector under the dash? The tach cluster comes with the tach wiring harness. Thanks. __________________ Lane 1979 Chevy SWB- (Second owner- Father in Law was first) 1979 Chevy Silverado SWB-Red/Red

12-02-2009, 10:52 PM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Standard guage to tach swap-78 chevy The tach wiring harness is seperate from teh cluster harness. It will have 3 wires (IIRC), and plug in to the tach only. You may have to repin the cluster wiring. If you can get the pigtail from the donor, it will make everything a lot easier. The colors will be the same, but may be in different locations. You will probably have to swap temp and oil senders as well.

12-02-2009, 11:02 PM	#3
ghettoluxury Registered User Join Date: Apr 2009 Location: Waynesfield Ohio Posts: 1,991	Re: Standard guage to tach swap-78 chevy trace the circit board on both clusters and see if they are the same if so you are good 2 go if not re-pin to match __________________ 1949 Five Window, 1973 Step Side, 2000 Z71



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