I guess that you have the push Switches made by eao. They directly mounted to circuit board which makes is a bit challenging to connect them with the rheostat. But you can Change the "bulb" or LED ínside.

BR

Christian

Attached Images
Schalter natura.jpg (235.84 KB, 195 downloads)
Switch demounted
Switches.jpg (35.04 KB, 193 downloads)
Switches
Morgan PCB.jpg (340.43 KB, 193 downloads)
Backside circuit board. The black "screws" fix the Switches to the board.
Switch.jpg (37.04 KB, 195 downloads)
From the eao catalog.
2006 4/4 70th anniversary, 1985 VW 1200 50th anniversary, 1977 Vespa 50 Special, 2003 Vespa PX 200E