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If you've gone that far just stop by the dealer and have them do it. Luckily I have a dealer who charges me real time, not the minimum 1hr. at $100/hr.
Take old cluster out, install new motor and needle. Then take it to gm for a reprogram, sounds like then adding a separate gauge all together.
yes, that is exactly what you're doing.
If it didn't require a tech II, it'd be cheap. That's the hang-up really. The good part is it looks cleaner than anything aftermarket since it's integrated.