RPM Gauge not working - JeepForum.com

 
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post #1 of 5 Old 09-01-2011, 11:20 PM Thread Starter
Jrcoyotes21
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1994 YJ Wrangler 
 
Join Date: Aug 2011
Location: Scottsdale
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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post #2 of 5 Old 09-02-2011, 04:10 AM
dodger889
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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.
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post #3 of 5 Old 09-02-2011, 06:34 AM
Berniebikes
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1988 YJ Wrangler 
 
Join Date: May 2010
Location: Williamsburg, VA
Posts: 793
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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post #4 of 5 Old 09-02-2011, 12:42 PM
GromMudder757
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1992 YJ Wrangler 
 
Join Date: Aug 2009
Location: Virginia Beach
Posts: 79
Do what charger said they are known for corrosion! then again its a jeep everything is known for corosion on em.

Zak
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post #5 of 5 Old 09-06-2011, 05:28 AM
larry408
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1991 YJ Wrangler 
 
Join Date: Feb 2010
Location: NW Arkansas
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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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