Well from what i know and i do know plenty, there is a peice on the tranny of the KA24 that you can take off and use on the sr to get it to read mph instead of KMPH its only a matter of 2 wires... but what good would a dash that reads 115 do when you wanna hit 200? i sent my engine and tranny out for some major work... boring out from 20 to a 24 with titanium pistons and upgraded rings n such... also porting and polishing , but it ran me 6000$, but i will do anything to go faster then my viper in my nissan lol... heres a pic of the viper at the gas station

 

there is a site that sells speedometers that are like 're-geared' or something so they go up to 180mph
i am sure someone here has the link