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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.
If your car isn't moving, the speedometer wont work. Make sure you are moving.
Seriously, a little more info would be nice.....but to start with, the speedometer cable is connected to the back of the speedometer and to the transmission. Have you removed the ends to see if there is any damage? You should be able to spin the cable end on the transmission and get the speedometer to register a speed.
Usually it's the opposite. The speedometer works and the odomater and trip meter go inop. Most likely the speedometer assembly is bad. If the odometer is working you have a signal from the gray and black wire .
number 1 probably problem with air mass meter
number 2 fuel pressure regulator or electrical solenoid on the high pressure fuel for activating-deactivating third piston
can you please send more info when it looses power etc...
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