Aftermarket tach install
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Aftermarket tach install
Bought a cheap tach for my truck and cant figure out where the wires should go. In the directions it says White wire gos to 12v dash lighting. Where would I find that? Red gos to Switched 12v (fuse box) where at on the fuse box?
Then Black Good chassis ground, then says 12-volt battery (the pic shows it hooked to the battery)
Green shows it going to a coil. Where at on the coil though?
Then Black Good chassis ground, then says 12-volt battery (the pic shows it hooked to the battery)
Green shows it going to a coil. Where at on the coil though?
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I hooked one up in my truck, the white wire is for the tach light, which you need to taph lights or the fuse for them, the red wire goes to a fuse that has poew when you turn on the key i.e. switched, black can go to any the is a good metal contact., like the dash support, the green goes to the tach lead on the coil, which on my 300 it's a green and yellow wire. I tapped mine off the harness on the fender well, and everything seems to be working....hope this helps.
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From: Virginia
Hook the white wire to any blue/red wire under the dash that feeds the dash illumination.
Go to the store and buy a fuse tap. Hook the red to a switched fuse like the radio fuse.
Hook the remaining wires just like the previous poster said.
Go to the store and buy a fuse tap. Hook the red to a switched fuse like the radio fuse.
Hook the remaining wires just like the previous poster said.
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
ok got all the wires hooked up except the Green wire. Should the Green/Yellow wire be on the coil or in the wiring harness? Ive found what looks like 2 green/yellow wires in the harness that splice into 1 then back into 2 wires.(maybe there used to be a tach?)
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Postmaster
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From: Jacksonville FL
I hooked up the Green wire to the green/yellow and it doesnt work so im guessing thats the wrong one.
The 2 Yellow/green spliced into 1 then back into 2
Red one on stereo fuse white one on dash light fuse. The other white one on stereo fuse was there when I bought the truck and I dont know what its to. Going to buy some fuse taps in a few hours.
Ground, couldnt find a good place to ground it becasue the wire is so short.
The 2 Yellow/green spliced into 1 then back into 2
Red one on stereo fuse white one on dash light fuse. The other white one on stereo fuse was there when I bought the truck and I dont know what its to. Going to buy some fuse taps in a few hours.
Ground, couldnt find a good place to ground it becasue the wire is so short.
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Yeah, darkish-green wire with a yellow stripe is the one. I used the one coming from the harness connected to the coil.
Maybe you aren't getting power, that is, if you are using the correct wire. Try hooking it to + terminal on the battery, and make sure you are using a good ground.
Maybe you aren't getting power, that is, if you are using the correct wire. Try hooking it to + terminal on the battery, and make sure you are using a good ground.
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Got it working thanks! Going to get some fuse taps now. That wire looked solid green but I looked on the back and it had a very faded stripe on it.
Last edited by 86F150302; Jan 9, 2008 at 06:04 PM.
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Postmaster
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From: Jacksonville FL
Well got back from the Auto store and they didnt have Fuse taps 
so I ended up just shoving the wire down into it and putting the fuse over it. Works great!
thanks for everones help
so I ended up just shoving the wire down into it and putting the fuse over it. Works great!thanks for everones help
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Postmaster
Joined: Dec 2007
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From: Jacksonville FL
Originally Posted by sbishop
what make or model of tach did you get? i'm thinking of getting a cheap one for my truck, thanks
Sbishop
Sbishop
