1/ You need to know if this engine requires a push or pull throttle cable therefore you need to have the matching cable. (Push means : your throttle cable phyiscally is pushed back towards the back of the boat.)
2/ You need to know if your foot throttle has a push or pull setup.
Some foot throttles can do both (as my hot foot throttle does) Off course it needs to match your engine setup.
3/ That leaves you with the correct throttle cable connectors/adaptors at the motor and at your foot throttle, which you must order together with your throttle cable.
It's not all that difficult, but it is a bit of a quest if you never did this before