Any advice on how to install two speed wipers into a 58 beetle (preferably keeping dash stock with ivory knobs).....for registration requirements on my mate's bug due to engine upgrade (36hp to around 150hp).

Also, a demister is required but since no heater boxes will be used, what to do about this??

Cheers
Alan

Are two-speed wipers actually required? I was under the impression that single-speed wipers are ok as long as they exceed the minimum speed for the fast setting on a two-speed set-up.

Is there any requirement that a demister actually has to blow hot air? Try the dash fans from a 70's kombi.:thumb If it really has to be hot, then try a 12V hair drier, but it will your battery flat pretty quickly.

1500 beetle, use their switch and change the knobs.

Thanks for the advice!

If I remember right, the 67 beetle in the US used the old style ivory knob but had two speeds, so you may be able to get one of these and use a simple dropping resistor to get a new "low" speed to statisfy the rego people.

If you are upgrading to 12v, then there is an elegant little circuit on my web site
http://www.geocities.com/aussiebug1970/wiper1.html 
for using the 6v wipers on 12v, and with a little experimenatation with the 330ohm "shorting" resistor (you'll see when you look at the diagram), you can easily arrange for two speeds (a lower resistance will increase the wiper speed).

you can also use a mitsubishi colt dash light dimmer. i installed one of these into my 58 and it was great (had a 6 volt wiper motor). you can vary the speed of the wiper motor from hardly moving to the wipers being sent into orbit. I had mine mounted where the choke cable used to be.
cheers:thumb