No s
No sir I haven't tried.... Is it possible to fit an encoder....Have you tried a small (cheap) DC motor ran as a generator, which is all the tach is anyway, just a refined one, if the original tach was 10v/1krpm then a DC motor with the same voltage should work.
i.e. 20v motor @2000rpm.
Most drives have a pot to calibrate the tach to fine tune it.
Max.