87 GN digital dash question

My 87 Buick Grand National has a Digital Dash that "Only" reads up to 85mph. Is there a way to have this dash read higher when going faster??

It really sucks that they made these Great cars have only up to 85mph readouts. I know for the regular dash one can purchase a different dash for it that reads 140 or so but I never came across anything for the digital dash that can do the same.

Thanks

I know for the regular dash one can purchase a different dash for it that reads 140 or so but I never came across anything for the digital dash that can do the same.

Thanks
dddd
They make a little screw in converter that screws in between your transmission and your speedo cable. it will conver the km/h over to MPH. so when you have the dash set on km/h you will accually be reading MPH. and since the km.h speedo goes up to 140 you will have a 140 mph speedo. ANS Performance and Engineering
2900 Soffel Avenue Melrose Park, IL 60160
1 (708)-450-1095 last time i checked they sold what you are looking for
its like 60 bucks or so

later