Yes, you can use any gauge cluster/tach housing from late '72 on up. I believe 100 mph speedo's came in '75. The '74 speedo was still 160 mph.
Glad to help...I just went through this as I'm putting a used '70 gauges/tach cluster in my '70 Formula that came without them. We're going the the process of swapping out the original non-gauge dash harness for one with gauges. I'm chronicling the swap in the 70-73 Firebird & TA Tech forum now in the thread "1970 Formula".
Dennis
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