Another Tach Question
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Senior User
Joined: Jul 2004
Posts: 199
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From: Griffin. GA
Another Tach Question
I am thinking about putting an aftermarket tach in my '78 F100 with the 300. But it doesn't have a tach at all. Would i need to buy an aftermarket ignition box or is there already a way to add a tach?
Posting Guru
Joined: Jan 2001
Posts: 2,357
Likes: 3
From: S. Mississippi
You've got 3 wires i think to hook up. One to illuminate the gauge at night. The second goes to the (-) side of the coil and the other should go to the (+) side if i remember correctly. No new ignition box required.
Elder User
Joined: Apr 2001
Posts: 772
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From: Glen Burnie Maryland
Most Tachs have 4 wires
White = Lights
Red = 12V Fused Power
Blk = Ground (go directly to battery with this one.)
Grn or Yel = Signal to Tach. Depending on make you would go to either the coil or an ignition box (Dodge is notorious for this). Like desperado said it goes to the neg. (-) side of the coil.
Pretty straight forward and they do come with instructions in English, French, Spanish............
Larry
White = Lights
Red = 12V Fused Power
Blk = Ground (go directly to battery with this one.)
Grn or Yel = Signal to Tach. Depending on make you would go to either the coil or an ignition box (Dodge is notorious for this). Like desperado said it goes to the neg. (-) side of the coil.
Pretty straight forward and they do come with instructions in English, French, Spanish............
Larry
