I want to add a push button starter button. Seems the Honda S2000 is very popular. I'm not sure how to wire. I will have an ignition w/key. Therefore I think I should put the starter wiring from ign switch on the run post and then to one side of the starter button and the other side to the starter. Does it need a relay or other electrical parts between the button and the starter? To turn off the engine I will use the key?