o yeah there is a way to test the N safety switch... instead of just R&R'ing it like you did the starter... dissconect the Nuetral Safety Switch and take a test light and prob each terminal and have someone run it through the gears... test light should only light when in N and Park other then them two it shouldnt light up at all... if it does then its fub'rd and if it doesnt light up in any gears check if there is power to the wires. then double check the wiring going to the Switch and then replace the NSS.
or just bypass the switch by connectiong a wire to it and grounding it