Tach hookup
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Junior User
Joined: Jul 2007
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From: Clearfield Pennsylvania
Tach hookup
I have a 92 F-150 with a 302 and am trying to hook up a Sun Super Tach 2 in it. It has a black wire which is obviously ground, and a red and white wire tied together with a blade on the end which looks like it fits in the fuse panel. Is this right? Which fuse should it plug into? It also has a green wire that needs to go to the ignition, but I have no idea where. Help!!!
Postmaster
Joined: Aug 2004
Posts: 4,004
Likes: 1
From: North of Boston MA
It's been a couple years since I hooked mine up but in the Sun ST II that I have, the wires are for ground, ignition, power and backlight. The power and backlight can be wired together as yours appears to be. Just hook those to any KEYED 12v power. It doesn't have to be at the fuse panel but it should be. The ground can be anywhere. The ignition wire goes to the TACH plug on the wires that go into the distributor. It should be marked as such.
If you want your backlight to dim with your dashlights, separate the two wires and wire the white (?) wire to the headlight switch.
Good luck.
If you want your backlight to dim with your dashlights, separate the two wires and wire the white (?) wire to the headlight switch.
Good luck.
Thread Starter
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Junior User
Joined: Jul 2007
Posts: 60
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From: Clearfield Pennsylvania
Thanks. I looked and I dont have a plug labeled TACH. Maybe it is because this truck did not come with one. Is there any wire that I could splice it to? Someone told me the negative side of the coil. There are two wires coming out of the coil, one red and one yellow.
Postmaster
Joined: Aug 2004
Posts: 4,004
Likes: 1
From: North of Boston MA
Even though your truck didn't have a tach originally, the plug should have a tach signal plug. There should be a plug going into the distributor and one of the slots should be open - molded on the plastic should be the word TACH. There probably isn't a wire there already. Clean off the plug and take another look. I'd go out and take a pic of mine but it is too dark already.
Postmaster
Joined: Aug 2004
Posts: 4,004
Likes: 1
From: North of Boston MA
Virto is probably right - it has been a couple years since I did mine and being that it is a long walk to the driveway, I may have given you bad info. Somewhere under the damned hood is a plug marked tach.....find it and you're in business. 
By the way, it is worth the extra work to hook the backlight up to the dimmer rheostat in your headlight switch.
By the way, it is worth the extra work to hook the backlight up to the dimmer rheostat in your headlight switch.
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