We have done enough 280zx cluster conversions for aftermarket gauges to justify 3d printing a set of adapter sleeves for use with aftermarket 3-3/8” gauges. There are plenty of offerings available from GlowShift, Speedhut, Autometer, and more.

These adapters will allow for a more bolt-in experience when modifying your own cluster for aftermarket gauges. You will need to epoxy the sleeves into the speedometer cluster face plate, which is a permanent modification.