Hi there,
The red/white wire is definitely the tach wire. Don't put it anywhere but on a tachometer. The red/yellow is for the overdrive light. The way I remember it, the connector is smaller (3/16") and fits on the small tab in the lower right corner.
The likely cause of an intermittent speedometer is at the rear of the car in the silicone-insulated flex cable between the sender on the differential and the car body grommet. It also could be a loose "L" connector on the cluster (speedometer) itself, but I think you would be able to see some action if you rapped on the dash as you were driving steady down a smooth road.
The intermittents are the hardest to find.
--
Art Benstein near Baltimore
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