For a car with rally gauges, in 1965 they used a separate "jumper" harness on top of the standard dash harness, in 66 AND 67 the rally gauge factory cars had a completely different dash wiring harness, including the fuse, block which is part of the complete dash harness assembly. IN 1968 they had a different harness, BUT a non-rally gauge one can be easily converted to rally style buy changing 2 of the wires in the plug-in connector, reason being the pathways of the printed circuit are different on the backside of the cluster from standard gauges to the rally option. In 65, 66 and 67 there was NO printed circuit just a lot of wires and lamp bulb sockets, they went to printed circuits to save money and also make it easier to remove the cluster anytime in case you needed service work.
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Peter Serio
Owner, Precision Pontiac
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