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Unread 09-02-2011, 12:20 AM   #1
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1994 YJ Wrangler 
Join Date: Aug 2011
Location: Scottsdale, Az
Posts: 13
RPM Gauge not working

does anyone know how the RPM gauge works? is there a sensor for it? is this a common problem? when i turn the ignition to on, the needle moves up to zero but then it just stays at zero even when the engine is running.
thanks for any help

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Unread 09-02-2011, 05:10 AM   #2
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1989 YJ Wrangler 
Join Date: Jan 2009
Location: mi
Posts: 4,160
First there is no sensor for the tach. It gets it's signal for the ECM. You should check the connection on the back of the speedo-tach panel for corrosion.
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 09-02-2011, 07:34 AM   #3
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1988 YJ Wrangler 
Join Date: May 2010
Location: Williamsburg, VA
Posts: 765
I've got an 88 so mine may be different, but the tach gets its signal from the negative terminal of the coil. It's a light green wire on my vehicle. I suspect that all YJ tachs work the same, but will wait for some more knowledgable gurus to chime in.
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Unread 09-02-2011, 01:42 PM   #4
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1992 YJ Wrangler 
Join Date: Aug 2009
Location: Virginia Beach, Virginia
Posts: 79
Do what charger said they are known for corrosion! then again its a jeep everything is known for corosion on em.

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Unread 09-06-2011, 06:28 AM   #5
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1991 YJ Wrangler 
Join Date: Feb 2010
Location: NW Arkansas
Posts: 365
I have one from a 91 YJ that I will sell if you need another one.
USAF 1968-1972
NRA Life
2004 WJ
1998 ZJ
1991 YJ
1973 Dodge Dart Sport
1980 Honda CB900c
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