[DML] Wacky tach - major issue???

["Derek" <derek.grozio@xxxxxxxxxxx>]

So, I get in the car to head to work today, make it half way down the 
block and decide that the window open is not going to be cool enough 
heading to work, so I close it up and turn on the AC to MAX. Right 
away the tach goes from aroudn 2k (in 3rd) to 7k. Now I immediately 
saw it and slammed on the clutch and put it in neutral. As I had the 
radio on and the AC blowing, I didn't hear the engine rev that much, 
but I wasn't certain. So, turned off the AC (assuming that was the 
issue, starting to troubleshoot) and get going again in first, 
without problem. I make it around the corner and down the street with 
no problem, so I put the AC back on and right away the tach starts 
jumping wildly again. This time the radio is off and the engine 
sounds completely normal, yet the tach is at 5.5k, 7k, 4k, all over 
the place. I slow a bit and it lowers by 2k. So, I turn around, head 
home, and park it. 

Heading home I was in 3rd and the tach showed 4k, yet the engine 
sounded fine. I thought it might be a belt as it seemed to happen 
when I kicked on the AC, but I heard no belt squeeling, but still 
checked the belts upon getting home and they were both there. Didnt 
have time to mess with the car as I was then running late so I left 
for work. Anyone have any idea what the issue could be? Tach going 
bad? Clean the tach ground above the relay compartment? Something 
worse???







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