It might be loose or corroded in the socket. Remove your dash and try wiggling the socket a bit. If that doesn't work, pop the lens off the dash, remove the rubber mount, pull the bulb, and check the connections there. If everything is good, check to see if you get 12v on that bulb connection when in neutral. If you do, the bulb is probably shot, if you don't, it could be your neutral switch.
