If you need to do this on a reg basis you can make a remote unit up.
I have one consisting of batter terminals 1(-ve) for earth, one(+ve) straight to solenoid, then two(+ve) standard wire cables with switches. Toggle switch for coil and a push button for starter(solenoid). Works extremely well.
I originally built it as a bolt in wiring loom for my demolition derby cars as we strip the wiring, dash etc out of the cars. Also gives you good control to sit in the car to test gauges etc and still have the luxury to kill the motor on a whim or incase of an emergency.
Cheers
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