Tach wireing question.
Thread Starter
Registered User
Joined: Dec 2007
Posts: 213
Likes: 1
From: Paradise, MT
Tach wireing question.
he OEM factory tachometer plug offers the following:
- 18ga Black = +12vdc for gage lights
- 20ga Orange = 12vdc Common
- 18ga Red = Switched +12vdc
- 20ga Grey w/light blue tracer = Tachometer Signal From PCM
Is the Orange wire a ground? Is that what common means? The orange wire on my truck has no power with the ignition on or off. Maybe this is a dumb question but I don't want to screw anything up.
- 18ga Black = +12vdc for gage lights
- 20ga Orange = 12vdc Common
- 18ga Red = Switched +12vdc
- 20ga Grey w/light blue tracer = Tachometer Signal From PCM
Is the Orange wire a ground? Is that what common means? The orange wire on my truck has no power with the ignition on or off. Maybe this is a dumb question but I don't want to screw anything up.
1st Generation Admin
Joined: Jan 2005
Posts: 4,601
Likes: 118
From: Buies Creek, NC
See if this'll help ~
-> The initial Tachometer plug and where the wires go from there (zoom in for a better view).
-> The Engine RPM signal wire from the PCM going to the plug (zoom in for a better view).
-> And the Switched +12vdc power going to the plug (zoom in for a better view).
As found in the sticky here ~ https://www.dieseltruckresource.com/...d.php?t=173561
-> The Engine RPM signal wire from the PCM going to the plug (zoom in for a better view).
-> And the Switched +12vdc power going to the plug (zoom in for a better view).
As found in the sticky here ~ https://www.dieseltruckresource.com/...d.php?t=173561
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