> The idea of having to switch back/forth just to set intervals isn't
> really convenient. Still, I look forward to using it.
>

Once you try it out, you'll see the genius in it. Say it starts raining a
bit harder and the interval  isn't short enough. To adjust, you just flip
the lever to off after it wipes. Then when you decide the window is getting
a little hard to see through, you simply flip it down to interval wipe
again. The interval is then set to wipe at EXACTLY the right time to keep
your vision clear.  No fiddling with a knob trying to guess where to set it.

> I wonder if it's possible to install a pot to adjust intervals?
>

I don't think you can do that with the 99, but the old 19 relay uses a
single resistor to determine the fixed delay. Replace that resistor with an
appropriate pot and it'd work.

--
John Bange
'90 Vanagon - "Lastwagen"
'90 Vanagon GL - "Wiesel"