so my 1998 chevy k2500 speedometer doesnt work so i test the speed sensor with a voltmeter put it on ac and use a drill with a bit to test the sensor since is just a magnet and the sensor does work the ac volt raise up when i use the drill. so what should i check next?

 

or anybody got the wiring diagram?

 

Check the wires going to the sensor as far back as you can.

 

ok thanks