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Old 07-15-2010, 01:29 PM   #1
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RPM window switch

I'm installing a 50 shot on my 09. Does anyone know if I need a tach driver for my window switch to work? I'm going to call NOS, but I thought I would ask on here also.


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Old 07-15-2010, 02:39 PM   #2
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I have mine hooked up to the tach signal wire from my tach driver. Of course, I have a 07 that didn't come with a tach to begin with so Im not sure you need one to get that signal on the newer cars.
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Old 07-16-2010, 09:42 PM   #3
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I have mine hooked up right to the coil but i dont know how it is on the 09 cars. I love my msd box
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Old 07-17-2010, 12:29 PM   #4
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For any 08+ guys who are/thinking about installing nitrous, I talked to NOS and you DONT need a tach driver. The window switch taps in the TPS wire and the impulse wire on your coil. I have the wiring diagram and the what color each wire is that you need to tap into. Let me know if you need the info.
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Old 07-17-2010, 09:21 PM   #5
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What kit are you using because the tps wire is on the throttle body
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Old 07-17-2010, 11:49 PM   #6
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it's thier universal drive-by-wire kit for 4-6 cylinders (05134NOS)....but yeah you're right. There are two TPS wires on the throttle body..I have to find which on has a rising or falling voltage...I think the Focus is falling?? I'll use a multi-meter to figure this out. There's another wire you run to the impulse wire on the coil.
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Old 07-18-2010, 07:19 AM   #7
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my wire on my throttle body is white
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Old 07-20-2010, 07:25 AM   #8
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NOTE: RPM Window switch TPS wire. (08+)

There are two TPS wires that go to the throttle body:
TP1 = Brown
TP2 = Green-Violet

You will need to find out which wire has either a rising or falling voltage. Have someone press the gas; use this wire for the window switch. The other wire should be constant.
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