[Sean]

There are no limit switches on that tuner. The large metal contact disk on the back of the tuner is separated into 2 segments with an insulator separating them. Depending upon where the selected preset is and where the tuner is when you select that preset, one section of the disk or the other will be selected. These segments determine which direction the motor turns to get to the correct position on the dial. Read page 15 of this service information on how the mechanism works and how to set it up.

http://www.nostalgiaair.org/PagesByModel...015848.pdf

When the dial is set to the station you have selected by its respective push button, the pin contact on the back of the tuner should be on set on the insulator. You may need to pull the contact pins out and file them to a point so they don't overrun the insulator as the motor is moving.