My tack reads incorrectly. what could be the cause?
Have a tack on the column that reads ok. Have a 2nd dash and switch tacks with no change ,both CV tack dash used. Is there something else that could cause this problem in the system?
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On page 3 in the Technical Bulletin section there is one about erratic tach power. Have you looked at it to see if might be useful ? My tach was completely dead back in the 90's and I had to send into a shop to fix the circuit board.
https://www.cosworthvega.com/tech-bulletins