how to wire an after market tach - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 12-28-2006
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how do i wire an after market tach

hey i am new on here an i was lookin for some help with wireing a tach on my truck. I have a 94 Ranger 4.0 2 wheel drive what wire do i splice into to get the tach read the rpm's...thanks guys

Last edited by brichmond; 12-29-2006 at 12:17 AM.
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Old 12-29-2006
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im not sure wat ignition module you have but i have the DIS module. there is a black and yellow wire that comes out of it on the bottom. splice the wire into the black and yellow.
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Old 12-30-2006
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On the chart for the tach I have it says for 91-94 4.0's it is the tan/yellow stripe wire.
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Old 12-30-2006
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The tach signal can be tapped from the tan/yellow which runs between the PCM and the instrument cluster.
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Old 12-31-2006
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hey guys thanks for the help but i still cannot find the tan/yellow wire!!! does anybody have a pic that showes me exactally where it is??
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Old 01-01-2007
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????? anybody have anything??????
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Old 01-01-2007
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The PCM is in a pocket in the firewall in the driver side rear corner of engine bay. The tan/yellow goes from pin #4 of the PCM, through the firewall into the interior and on to the back of the instrument cluster. IMO, the easiest place to tap it for an A/M tach would be where the harness enters the interior at the large bulkead connector under the DS of the dash.
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Old 01-01-2007
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i couldnt find the tan/watever either mine is currently hooked into the black/yellow on the DIS module and works fine. but then again my orig. tach did not work so i had to improvise with the wiring diagram. the black/yellow carries the engine rev info to the comp. i believe.
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Old 01-02-2007
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ok ill c what i can do thaks guys
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Old 01-02-2007
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how do i know what one is pin #4 i have never worked on any car that is fuel injected or newer than 1987 im pretty new to this kinda stuff. a diagram of it would help me the most. thanks
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Old 01-02-2007
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It's in the 60-pin connector to the PCM. Pin 4 is the 4th one in near one of the corners.

Look for the color code.
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Old 01-06-2007
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i finally got arround to lookin arround...no i cannot find the tan/ yellow wire...and as far as the black and yellow wire i dont want to test that an blow something up....if somebody could show me a picture of where the tan/yellow wire is in the engine bay that would help a whole lot..seeing as the weather is starting to drop i would like to do this while it is still kinda warm
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  #13  
Old 01-06-2007
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hey man look to see if you can find the coil and hook it up that way
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Old 01-06-2007
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hook it up by the coil..ok there are 5 wires comeing out of the side of the coil...are there more on the bottom of it or what wire do i splice into off of the coil
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  #15  
Old 01-07-2007
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???? 18 hours later and nothing??? u guys really do know your stuff..i just cant wait every other day to get a respond. sorry for the inconvienance
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