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Originally Posted by RUN-EM
Problem is the tach works great with air con off. When on, at idle, tach registers zero. Upon reving up in gear, starts reading again at about 2000 rpm and continues until 3500 in hi gear when it again begins to jump all over. Tach revs normally from 2000 to shift point thru the gears, just bounces when it hits 3500-3600 in hi gear. Any ideas 
Regards 
Run-em |
OK your first sin is that you didn't state what brand/model/year of car you have. I am going to guess a Rambler with a vacuum tach and the electric pump that runs the AC compressor is using tooo much vacuum. 
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1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C
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