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The 1998 TDI uses an electronic speedo. Assuming all the other gauges on the dash are working, then it is not a blown fuse. In this case it is either the pick up from the gearbox, the speedo itself or the wiring in between. The easiest way to check is by substitution of the speedo or the pick up one at a time. If this fixes it then the wiring is OK. If it doesn't fix it, then go looking for a wiring fault. Given the age, the wiring behind the dash can fail either by open circuit or shorting, so I usually just run new wires if I get a fault in one.
not sure here completely but if none of it is working either a eart wire is no good or you need a new quadro ,or in english a speedo head complete and its not cheap
98 tdi has electronic speedo and the most likley fault is the speed sensor on the transfer box just infront of the handbrake drum on the lefthand side it is held in by a 10mm headed bolt
the plastic speedo gear on the differential breaks, differential has to be removed, and new bearing and drive gear pressed on.. can be repaired with trans in the vehicle
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