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Old 07-17-2005, 02:57 PM
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F-150 2005 Putting Tach In Truck

My son in law is trying to put in a tach in his 2005 f-150 truck 4.6 liters . We are having trouble finding the ignition coil on the truck. the tach is a Sunpro and the green lead is the one that goes to the ignition coil . Also is there anyone out there that can lead us to a breakdown of the ignition system on this truck and have an exploded view on the web. We want to make sure we hook this up right so we do not fry the computer.

Thank you for your help,

Dobie1965

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Old 07-17-2005, 06:34 PM
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the mod motors run coil packs. If i'm not mistaken you have to get an adapter to hook up an after market tach on those. but i'm a schnook. post your question in the electrical forum, or if you haven't already, try a search on "mod motor tach" and see if theres anything there.... btw welcome to HR.com
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Old 07-17-2005, 07:19 PM
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I thought I had seen an adaptor somewheres also, but of course can't remember where.
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Old 07-17-2005, 07:44 PM
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Going tp move this to the "Electrical" forum........maybe Doc, our resident electrical guru knows about this...............
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Old 07-19-2005, 06:41 PM
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Hmm....I believe you have to take the signal off the ECM itself. The '96 crown vic I owned had a tach output right on the coil pack. The newer mod motors use coil-on-plug, so you can't just plug a tach into a coil pack like on the older ones. I believe you will have to use the same line that is used by the factory tach. I'm not sure if you will need an adapter or not. If you get a shop manual with the wiring diagrams for it that would help a lot.

Not a huge dis, but if he wanted a tach why didn't he just get a XLT which has it from the factory?

My 2004 is a V6 5sp and I don't have a tach.....have never had a problem.
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