I finished the gauges restore.
I my self sanded and polished the plastic lens, changed the old face plate by a new one, changed the jewels and painted the needles.
A professional refilled the damper and cleaned the gauge and lubrifricated the internal componentes.
The speedometer had a diecast gear. Marcel den Butter sold me a sandacst gear.
Now both, speedometer and tachometer works perfectly.
Marcello