[mr48chev]

There wouldn't be any linkage, the button would fasten to the floor though the same hole that the original pedal went though. A hot wire would hook to one side and a wire (same as the purple wire in a key switch setup) would run from the foot switch to the starter solenoid. The big issue is if you have room in that spot for the switch to stick out on the other side of the firewall. Some engine swaps take up all the room in that area. The Tractor Supply one is about 7.95 and you could stick it though the hole upside down from the inside to mark the spots to drill the holes to mount it. About a 15 minute job start to finish if you have someone who can hold it while you put the screws in.