Most auto parts stores carry remote start switches for this purpose. Fairly cheap. Otherwise you just need a cheap little push button switch (one you have to hold down to activate) and two pieces of wire. Run one to the hot side of the battery and the other to the solenoid on the starter.
When I checked compression on my truck I simply leaned over the fender, screwed the fitting into the spark plug hole and then leaned in the window and turned the engine over a couple times.