i spent quite a bit of time doing homework on where to put my dash switches. i found that there are many different true porsche configurations - depending on the year.
here are some for reference:
pre-a, a few a's, and a totally bad-ass '49 i regularly drool over
you'll see most have 4. two on the left and 2 on the right. i went with a more simple, one on the left and two on the right.
left: pull vw headlight switch
right: vw ignition (no accessory on mine - which i would recommend getting if you are buying/sourcing a new one)
right: vw washer / wiper switch. i had to get really creative for this. i took the switch all apart and put in an electrical switch where the vacuum one was (button in the middle). i didnt want any other dash switches.
all my other switches are below the dash (air suspension, fog lights, heated seats, etc)