I say yes, he say's, seperate the speedo ground and that will do it. So I'm gonna try it and I'll post my finding's later. I sure hope this fixes the problem.
once you separate the grounds they will say to separate the power and run the speedo with its own power. after that they will say your sensor wire need to be shielded because its picking up interference. gee it would be nice if the directions mentioned that crap. went through that crap with my autometer speedo. wish i would have bought a gps speedo.