Got the tach in place. Looking at the chassis manual, its showing a one prong connector, and I have a two prong going to the factory tach. Anyhow, on my two prong connector, I have 12 volts on both the brown, AND orange wire. The chassis manual isn't telling me much as far as wiring color, OR Im missing it Which one is the signal wire for the tach?
A factory tach has a single brown wire going to it that runs to the coil. It was taped onto the dash harness. That two prong connector looks like its for the clock.
This is what I have for the clock plug, its a two prong "T" My factory tach has an "L" shaped two prong connector Ima thinking the brown wire is signal???
LAAAARRRRRRY I do know that I added the MSD Tach adapter many years ago??? That's the downfall to owning the same car since '85, yah don't remember what all you did to it
That is the connector for the clock. The clock works all the time, so the orange is full time 12 volts, the black (it's not brown) is ground. You can't use that for power for the tachometer. You can use the ground connection if you like. The gray is lighting, tap into that. Run new wiring for everything else. Run an ignition on 12 volt lead and a new signal wire.
You likely don't need the tach adapter. Most aftermarket tachs are made for use with MSD box directly. So you can probably ditch it.
That's probably what I'll end up doing, and run a new wire from the tach output of my MSD 6A to my tach. Wish I remembered what I did 20 some years ago
I actually read the directions, this warning kinda tripped me up See, reading directions causes panic
Right, you don't connect the tach directly to the coil if you have MSD, its gotta go directly to the box. . On my old 6A box, there is a tach output connector on the side that my signal wire is connected to . In fact, I run a factory tach off my 6A box
Got ‘er wired and working, took a vid while on my knees on the garage floor and working the gas with my hand, man this was easier 30 years ago
Yeah, even if the job had to be done more than once because of being young and dumb, it was still easier!
Pain in the rear, isn't it? Looks good! It's a must do because the factory tach is a 6 grander. See that tiny button above the defroster switch? shhhhhh, don't tell Guy.