my speedo doesn't work properly, some times it gives you the speed, then it goes back to zero then a few minutes later it will work again for a little then back to zero.....
yesterday I went with my kids to the desert to have fun on a dry lake, cuz it rain and it's a little muddy. no big pool or anything. I pressure washed completly the truck. could some mud caising this?
how does the speedo use a sensor or is it a cable ?
what I should look for ?

thanks again for your help !!!

 

What kinda truck you got and mileage?

 

2001 disco II. 86K miles