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Old 11-20-2007
AgPete139's Avatar
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Join Date: Aug 2007
Location: Houston
Posts: 408
4.0L Tach Install Help

Hey Guys,

I bought a brand new Super Pro 3" tach from a guy on Craigslist for $15 last week.
No cut wires, or tampering, but it does have a small external scratch from storage.

So here I am. I took the tach apart and switched it for 6 cylinder engines. I spliced the GREEN WIRE into what I believe is Pin 48 on the passenger side firewall for my '97 4.0L w/ the 5R55E. It was BROWN w/ YELLOW stripe, and I never saw a TAN w/ YELLOW stripe in the cluster. I roughly tested all the wires in the engine bay to get the tach to work, but it just vibrated above the 0 (almost 50-100 rpms). I hit the throttle and the needle only jumps up to ~ 900 rpms (normally ~4500 rpms).

4 wires:
white=gauge illumination
green=tach signal.


I have tried to figure this one out, but can't figure it out. The power is correct, the ground is secured, and the only thing I can guess is the green signal.

I think it may be different as I have 3 coils instead of 1. Where can I hook up my tach signal in the dash or wherever there is a combined EDIS?


Thanks for everyone's help in advance,
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Old 11-21-2007
AgPete139's Avatar
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Old 11-26-2007
Join Date: Nov 2007
Location: Sebring
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in my mustang cobra it wire was green with a white strip.....try that
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Old 11-26-2007
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The 97 Ranger tach wire is tan/yellow and it runs from PCM pin 48 to the instrument cluster. There is brown/yellow in the wire bundle from the PCM but it runs to the #3 fuel injector. Each injector fires once for every 6 ignition pulses, so that could explain the low tach reading.
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