The easiest place is probably the back of the 4 way flasher switch.
There are 2 small gray/blue wires going to one place on that switch.
Splice into one of those. Be warned that before 85 VW did not put a fuse
in the wiring for the adjustable dash lighting circuit.

Mark

Don Hanson wrote:
>    ...and I am such an electrical dunce that I'm often better off asking than
> trying to figure it out from Bently diagrams or circuit stuff.  I am
> learning, but...
>
>    I have an 84.  I am mounting Oil Temp and Oil pressure gauges..I know how
> to get the gauge signals right and make the gauges work properly...but can
> someone tell me where to get a "modulated' power lead for the gauge lights?
> A source that is controlled by the instrument panel dimmer switch?  The
> gauges..one Autometer one VDO both have secondary circuits to a little
> plug-in light...Positive and ground spade terminals.  So if it's possible, I
> would like to tie those into my dash lights so they all dim the same
> amount.  I find having gauges that aren't dimmable (nice word, eh?) is
> distracting on long dark late night drives...
>
>    Can someone direct me to the right place to take off the power for the
> gauge lights?  Back of the wheel below the headlight switch maybe?  Or right
> at the foil somewhere?
>
>    Theory will be wasted on me.  I try, but I know not the diff between a
> resistor and a capacitor, a watt and an amp...an Ohm and an armature..
>
>    Thanks, if anyone has the time..  Don Hanson
>