The FJ40 cluster
The FJ40 (roughly 1960–1984) uses a cable-driven speedometer alongside fuel, temperature, oil-pressure and amp gauges in one cluster. Both MPH and km h variants exist, and the km h and MPH faces can generally be swapped without recalibration where the mechanism matches — useful for imports.
Removing the cluster
It's a friendly job: disconnect the battery first (a loose cluster shorts gauges easily), unhook the speedometer cable, remove the two screws, and tilt the top of the cluster toward the steering wheel to clear the tabs and lift it out, then disconnect the harness plugs.
Reface it yourself, or send it out
DIY gauge-face restoration packages supply all the correct markings so you can bead-blast or strip the faces and reprint them at home — a low-cost route to a fresh cluster. For the speedometer mechanism itself, or a concours result, professional cluster restoration is available.
Recalibration for bigger tyres or diff swaps
Fit taller tyres or regear the axles and the FJ40 speedometer will read wrong. Correct it with a matched driven gear or a speedometer recalibration / conversion for your new rolling diameter — the same turns-per-mile logic as any cable-drive unit.