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I'm not sure if the Super Tach was out earlier than '68
Verne
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I'm thinking '65 or '66 for the SST 70 & 90.

They both required to EB9A though. I'll have to look at mine but I think the SST90 has a white needle, orange shift indicator and a green stripe vs. the blue stripe like the one on the far right in Joe's picture.