How to change a car speedometer?

I have seen cars with stock speedometer and maximum speeds says 150mph then people change the speedometer and the new one says maximum speed is 180mph? These cars was the Honda prelude by the way. My question was when they change it to faster speedometer will the car actually go faster? And would the speed it says the car is going will that be accurate?

Changing the speedometer has no effect on the actual top speed on your prelude. What most people do to get rid of the engine being governed at top speed is that they put an aftermarket engine management system like hondata. I'm not sure but if you look up ecu reflash you might find if that also removes the top speed geverment