1967 Barracuda rallye dash instrument panel housing with ac

There isn't as much difference in the gauges. 67 speedo uses a different cable from 68 up but a new different cable is what, 18 bucks? Any speedometer shown there is apt to need restore, especially if it has a trip clock ( and most do ). I won't go into all I know about those. Anyway,,, what you pay initially is the only difference. 120 can be converted to 150 by the restorer.
In general, Tach is correct for manual trans car. Performance indicator is correct for automatic trans. A slant 6 car could have the performance indicator and a formula S with automatic trans could have a tach.