Need help installing a tach
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New User
Joined: May 2005
Posts: 21
Likes: 0
Need help installing a tach
I just purchased my first truck, a 1990 F350 CC, and it did not come with a tach originally. I need som help installing one, I already hooked up the lighting and ground wires but I am having trouble with the green wire that connects to the negative on the ignition coil and the red wire that connects to a switched 12V source on fuse box. Any advice would be helpful, and I'm not the best with this stuff so please be detailed. Thanks.
Freshman User
Joined: Nov 2005
Posts: 37
Likes: 0
Quite simple actually, just did it myself a couple of months ago. First, the red wire you can connect to any power source. You have a few options, my truck has a wire that comes directly from the battery to a trailer brake controller, so I was able to get my power there (red wire). Also, you can get your current on the power point, sort of like a lighter socket middle of the dashboard. I cannot remember the exact colour of the wire, but can check for you if need be. Finally, the tack wire itself, I ran a wire from the negative side of the coil, which is the beige coloured wire, through the firewall and to the tack wire on the gauge. Hope this helps, let me know how is goes or if you need any more help.
Posting Guru
Joined: Apr 2005
Posts: 2,246
Likes: 2
From: Hawkeye Country
ive got my power wire pushed in behind the turn signal fuse in the fusebox. as for the tach wire it goes negative wire on the coil, the negative on mine is the wire on the left side of the coil, for mine i just crimped a male end of a quick disconnect on the green tach wire and pushed it in next to the yellowish brown wire of the coil. the tach install can be down without hacking up your factory wires
Elder User
Joined: Jul 2004
Posts: 620
Likes: 1
From: Toronto, ON
there's an easier/cleaner way to hook up your tach wire.
i hooked up all 4 wires from the aftermarket tach to the wire harness that goes to the gauge cluster. i simply found the 4 wires i'd need using a wiring diagram in the haynes manual, and it labels the colors of the wires to make it easy to find them
i simply just taped into the wires.
(yes, there's a tach signal wire that goes to the gauge cluster!)
i hooked up all 4 wires from the aftermarket tach to the wire harness that goes to the gauge cluster. i simply found the 4 wires i'd need using a wiring diagram in the haynes manual, and it labels the colors of the wires to make it easy to find them
i simply just taped into the wires.
(yes, there's a tach signal wire that goes to the gauge cluster!)
