It would really help to know what model and year car you have. There are repair shops that will do work on VDO gauges, but most that I have seen are pretty expensive. It may be cheaper to look for replacements on Ebay or at breaker yards. Most VDO mechanical odometers have a design fault, usually the mounting of the gears, that make the suseptible to breaking. Mercedes, Porsche, Volvo and BMW owners pretty much share the grief.

One tip to lengthen the live of any VDO trip odometer . . . don't do a reset while the car is moving.