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how do i connect a analogue rev counter to my vauxhall astra mk2?

i have an astra mk2 and i am putting a vauxhall cavalier dashboard into it but i need to know where the wire from the rev counter has to be connected to the engine to register the revs

December 2004
Connect to coil -ve (or ECU rev counter output0

John O ..
January 2005


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