Speedometer was working on and off but now don't work at all

My 98 villager did the same thing i changed vehicle speed sensor and now it works . it is located on the transmission you will have to jack up the van , use safety jacks , it is on the rear left side of the tranny look up on top there will be a electrical connector there unplug it and at the bottom of the sensor there is a 10mm bolt holding the sensor in place kinda like a distributer is mounted to the manifold , pull it out of the trans be carefull i broke mine off at the plastic connector, the part of the sensor you are looking to move is the base it is about the size of a silver dollar at the bottom of the sensor, a little heat to the side of the trans where it goes down may aid in the removal ,it is about 3nches long and has a rubber oring around it ,and a speedometer gear at the end of it, lot easier putting in than taking out ,,,good luck