Here is Teds old post.
https://www.speedsterowners.co...-new-ignition-switch
To install the Bosch classic switch installed in many 356 and our cars. ( same switch and key shape minus the Porsche logo on the key.. sold at NLA, Stoddard, Sierra Madre, and most local NAPA/ Oreleys, Autozone). http://www.bosch-classic.com/e...er_03423090xx_1.html
in short;
50 = Starter Control
75 = Acc (radio, cig lighter)
15 = Ignition
30 = Battery
ALSO- size of the switch hole.
Chinese switch hole will likely be a little smaller than the hole you will need to install the new Bosch switch. Some light sanding by hand of the inside of the hole should be enough to increase the opening diameter of the hole. You can also use a small drimmel sanding tool- if you have a stray hand. I did it by hand with some light grid paper... I preferred to go slow — until I could easily slide in the new switch.
What to do;
VS wiring/ Chinese switch ( pictured top) to Bosch picture below)
30 goes to battery--- two thick red cables
15 goes to ignition-- thin black
50 goes to starter-- thin red cable
75 ... goes to radio/ lighter if you have one... the above VS Chinese picture picture does not have a wire connected/5th accessories wire not shown.
Hope this is useful.
cheers