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just started doing it today , steady rpm say 2500 and its like little ticks it is like 1-200 rpm and it is 2500 ,2800 2500 2400 like that and its not fluctuation they are definite ticks
Any usual places to start looking
1998 roadking police
Check the easy stuff first .
Look for a bad ground then go to bad wiring to the tach.
If you find either then its time to check all the old wiring for
trouble spots.