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The term "power pack" when it comes to Commodores and Statesmans refers to the electric windows/door locks/mirrows and arial options for the Berlina or Executice.^ It's not a Commodore it's a Statesman.
Anyone know what a power pack is?
On the back of the cluster is the pin outs. One of the connectors will have the tacho wire. Match the number from the back of the cluster to the connector and you will have your tacho wire. Then it's see if you can find the same colour wire in the loom and teast for continuity. Also ytou could try a by pass wire from as close to the cluster as you can to the other end and see if that brings the tacho back to life.Bump, need some help