Wiring up factory tachometer.
05-08-17, 08:39 PM
#1
LegacyCore
Thread Starter
Wiring up factory tachometer.
Hey everybody I'm needing help wiring up my factory tach in my 86 Sport Edition. I've ditched the EFI setup for a Weber carb, so I'm not using the factory leading and trailing coils anymore. Instead I have an MSD 6AL and three MSD Blaster 2 coils. Two coils are daisy chained together from the MSD box to my trailing plugs, and the third coil is powering the leading side of the distributor. Because of all of this I'm no longer getting a signal to my factory tach.
From what I've read the factory tach gets it's signal from a yellow/blue wire at the factory trailing coil harness. So at first I ran a wire from one of my trailing blaster 2 coils negative terminals. But no go, so then I ran a wire from the MSD 6AL "tach" signal space off the box to the yellow/blue wire in the factory harness, and still no signal.
Is there something I'm missing? Am I using the wrong wire completely? How do I get my factory tach working with my setup, because I'd really rather not install an aftermarket tach.
From what I've read the factory tach gets it's signal from a yellow/blue wire at the factory trailing coil harness. So at first I ran a wire from one of my trailing blaster 2 coils negative terminals. But no go, so then I ran a wire from the MSD 6AL "tach" signal space off the box to the yellow/blue wire in the factory harness, and still no signal.
Is there something I'm missing? Am I using the wrong wire completely? How do I get my factory tach working with my setup, because I'd really rather not install an aftermarket tach.
05-16-17, 10:52 PM
#3
LegacyCore
Thread Starter
Update for those needing one. It is the yellow/blue wire that leads into the factory trailing coil. I ran the tach spade port from my MSD directly to the yellow/blue wire in question bypassing my coils completely and the factory tach is now working.
