I don't have the exact changeover date, but I joined the reserves in 78, and the jeeps in the FGH already had several coats of paint by that point. The 5/4 tons came out in 76 and they too already had the cam pattern from the factory. The same cam pattern was used earlier but with white instead of one of the greens. Of the 30 M151A2s I bought, I only noticed the white pattern on one of them, so it was likely phased out by the mid 70s. As well, most of the 3/4 tons I saw had the white rather than the green.
There seemed to be a mix of the cam pattern with the white vs the solid semi gloss green depending on what unit the trucks were with. Comm squadrons in particular did not seem too quick to cam their vehicles.
Based on all this, I would guess at mid 70s for the change to 3 colors of green.
As to the colored tach signs, I believe they changed around the late 60s. Again, the comm squdrons seemed to keep their colored tach signs a lot longer. In fact the decals for the comm sqn tach signs were still available in the supply system not that many years ago.
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