OEM tachometer 85cj7 wiring. Thread starter jostrick; Start date Nov 11, 2018; Tags 85cj7.. If you haven't played with the wiring under the dash, it may still work with your EFI. The 6 cylinder tach is not calibrated correctly for a V8, so this may account for the innaccuracy found by some. The factory 4 cylinder tach works like the aftermarket tachs, getting the pulse from the coil negative, but it also won't read correctly with a 6.
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Jeep CJ Forum CJ tach wiring. Jump to Latest. LINK:Dual Battery Diagrams & Explanations. LINK:Winch, Welding, 'Lend Power' Project,. Unplug that connector, and have the tach in series, so red wire coming from the ignition switch, to tach, then tach to the firewall side red wire connector. May have to try swapping the wires on the tach.. Jeep CJ Showcase. 2011-2019 Jeep Grand Cherokee WK2;. wiring diagram and clear instructions are included to assist in installation, assuring the proper connections are made and the new gauge is receiving the correct. Easy to wire. Font doesn't quite match OEM but what do you expect for a vehicle that hasn't been made for over 35 years..