I BOUGHT THIS 60'S SPEEDO AND WHEN I GOT ABOVE 30 THE METAL FINGERS YOU PUT IN THE SPOKES ON THE SENDING UNIT BENT STRAIGHT SO I HAD TO ZIP TIE THEM TO THE SPOKES UP FRONT . COME TO THINK OF IT THOSE ARE THE ONLY ZIP TIES ON MY BIKE .
I never had good luck with the mechanical speedometer's on my bike and have gone through 2 of them! the vibrations make the needle jump all over the place and gives you a false speed and then leads to false mileage. I like the wired digitals the best and the chrome cruiser I have I used a old school speedo housing , took out the guts and replaced with a digital speedo inside and I get accurate speeds and mileage and still retain that old school look.