I need a tach install sticky/diy

its got 4 wires...
1 to the coil
1 ground wire
one to a 12 volt source
and one to the headlight switch for the light

a 7" tach?! lol i think you mean 5".

anyways, yeah man, you have to run it to the tach, it's way less complicated that way anyway. just put a male spade connector on the end of it and run it through the firewall.

for the illumination wire, splice into the headlight switch harness. i can't remember which wire it is exactly, it's been a while since i wired one, and i took mine out last year and sold it. just get a test light and see which wire gets power when the switch is on, and no power when off.

for the 12v, you have to use a switched source, otherwise your tach will always have power. iirc, i spliced into the 12v switch wire for my radio. any accessory that only works with the key to the "on" position will work.

im sure you know what to do with a ground...either put a loop terminal on the end of it and bolt it to a piece of metal somewhere, or splice it into a ground wire for anything.

green goes to you coil
red goes to ignition
black is ground and
white is ur light source

The interwebz is ur friend

http://www.egauges.com/pdf/AutoMeter/407j.pdf

If that doesn't do it maybe one of these will:

Auto Meter Instructions

Makdaddymac said:

lol yeah 5"

cenok when you say "tach" you mean coil right??,where exactly do i connect it?

the ground is a no brainer....
the 12v is ok but what wire/sorces are remote.....????

so im guessing the green goes to the coil or the white....
i have red ,green, white and black.

Click to expand...

hah yeah my bad, i meant to type coil. you just stick it down in the hot wire. like i said, the radio has a 12v switched wire, that'd probably be the easiest one to splice into, or into the actual ignition wiring in the steering column. white is illumination, the one that splices into the headlight switch, red is 12v switch, black is ground, green goes to the coil. the first link 85ss posted has a nice little diagram you can use.