Condenser question

That is a noise suppression capacitor so yes it goes in the center female slot where 12 volts enters. Its purpose is to prevent a pop noise in radio speaker when mechanical limiters contacts open and close. many models have a similar noise suppression cap' somewhere in the ignition system.
You could plug a solid state regulator in the limiters slots (like RTE4 for example) and no longer need the noise suppression but at the same time you'll have a less tight fit there due to the lack of second male tang in that female connector of the circuit board.