A great way to cook a steak is to let it speak to you, if you let your barbeque heat up to 350-400 degrees then get a nice sear on it. Dont flip the steak until the steak just comes off the grill like no problem. If you are having to put pressure then the steak is telling you its not ready yet. do this for both sides then just watch it while you but the box marks on it and it should be cooked perfectly medium rare to medium. A probe is a great way to make sure not to mess up the temperature, but remember to watch it too. Sometimes technology isnt the best thing to rely on.