Shane Posted February 16, 2011 Share Posted February 16, 2011 I have an 89 MJ that is a 4x4 and automatic on the column. Did the gauge upgrade to the one with the needles and changed sending units. All is fine with the exception of the tach does not work. I cleaned the connectors and still nothing. The tach previously worked (seen it 1st hand). What could be the problem and how could I fix it. As always any and all advice is appreciated, Thanks Link to comment Share on other sites More sharing options...
jimoshel Posted February 16, 2011 Share Posted February 16, 2011 Did you see the tach work after you installed it? or before you removed it from the donor? Link to comment Share on other sites More sharing options...
Shane Posted February 16, 2011 Author Share Posted February 16, 2011 Both. It work after it was reinstalled for maybe a day :hmm: Link to comment Share on other sites More sharing options...
jimoshel Posted February 17, 2011 Share Posted February 17, 2011 I would suspect a wire or connection came apart. If they're OK then Check for output from the ign control module. Pin 1, Diagnostic Connector 1. Link to comment Share on other sites More sharing options...
kyleag89 Posted February 17, 2011 Share Posted February 17, 2011 Also check the printed circuit on the back of the cluster. See if you have power to the IGN screw on the back of the tach. Link to comment Share on other sites More sharing options...
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