Need help wiring a tach
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New User
Joined: May 2005
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Need help wiring 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.
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Thread Starter
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New User
Joined: May 2005
Posts: 21
Likes: 0
Need help wiring 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.
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Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
The green wire will hook to the coil where the condensor/noise reducer is hooked in. Just splice it into the wire. In teh fuse box you should have a few connectors labeled "IGN" those are hot when the key is in the "run" position. Use one of them for the red wire. If you have an aftermarket radio you could also splice the red wire from the tach into the red wire on the radio.
Posting Legend
Joined: Sep 2001
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Hello- Welcome to FTE! I have moved your post to the specialized forum we have here for your question. Check out the list of tech forums we have here. There is a wealth of information and expertise here to help you. There are a number of links in my sig below to help you also. Have fun! 
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