Tac was bouncing around than died ( 93 100 csq 12v)

[Tom B]

Hey all,
My tachometer on my 93 100 csq (12 valve 6 cylinder) started bouncing around 
this morning and then finally quit giving any reading at all. Can someone 
inform me as to where the tac gets its signal on these cars? I'm hoping that 
there is an intermittant break in the wire, or an inproperly seated 
connector. Anyone have any other ideas?
Thanks,
Tom

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