ok i know this isnt a very interesting topic, but i know mustangs should have variable windshield wipers, but i dont. ive got the different sized dashes on the **** coming off the steering column and everything. but all i have is low and high. do i need a new switch on the steering column?? any ideas?

 

I had a 90 f150 that had some type of relay regulator under the dash, I think the stang may have the same set up, could be the switch though.