Gauge Conversion for 1967-1968

Short answer: On a 1967–68, converting from idiot lights to a Rally gauge cluster is not a simple pin swap. You can get the oil and water gauges to read fairly easily, but making the ammeter work requires reworking the harnesses all the way back to the voltage regulator — the Rally setup has extra wires the idiot-light cars don’t.

Realistically you either re-pin and add wiring to the bulkhead connector, forward-lamp harness, and dash harness, or buy the correct harnesses. (1969 is far easier.)

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