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Old 12-10-2010, 12:19 PM   #1
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Exclamation after market tach 08 f150

Hi, i am trying to install a sunpro tach into my 08 f150 xl v6 4.2l the original cluster does not have a tachometer in it. i am having trouble finding the correct wire to splice into to give me a rpm reading. I tried a wire that gave a negative reading off the coil pack i had feed back but it was fairly unresponsive. Has anyone tried this before or have any insight as to which wire i can splice to get my rpm reading? Any information would be greatly appreciated im at a standstill on this project at the moment
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Old 12-10-2010, 12:39 PM   #2
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try to find an xlt cluster with tach on it...i heard its fairly easy to do
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Old 12-11-2010, 11:41 AM   #3
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Check further in this forum for the Aftermarket tach question thread... I just installed a Sunpro tach in my '05 STX with the 4.6 V-8, and you'll find all the info in the thread... I had to purchase an Autometer tach adapter #9117 ($75.00 from Summit). This sets up the correct signal for COP and DIS ignition systems. Once installed, it was a no brainer, and the tach works great.

Last edited by Steve 39; 12-11-2010 at 11:45 AM. Reason: more info
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Old 12-11-2010, 02:09 PM   #4
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you can use a injector wire or COP wire do not use the red wire on the COP's or fuel injector i just had the issue of finding a tach signal wire for my remote start system...hope this helps
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Old 12-11-2010, 05:26 PM   #5
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After the purchase of the tach and tach adaptor, you would be money ahead in buying a cluster from an XLT or STX with the tach included. Only the mileage would require reflashing if you wanted it to match.
"Never argue with an idiot; they'll only drag you down to their level, then beat you with experience"

2007 F150 STX Supercab (4.6 2V V8), Edge tuner, factory navigation, Mark VIII electric fan conversion with flex-o-lite controller.
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