This 'How to' uses the Mk2 knobs(black and grey) But will work with the Mk1 knobs also.
I have always found it difficult to see which end of the controls was the one with the 'black dot pointer' when driving.
This means that sometimes you have to rotate the knob both ways to figure it out. I think that sometimes the controls are broken because of this.
I thought what we need here is a more prominent method of denoting the pointer.
Soooo, I found some old 5mm clear leds,
and snipped the legs off.
Using the black dot as a start point
I drilled a hole through the heater control, sized to be a neat fit on the led (be aware that 5mmm leds are actually about 4.7mm diameter)
I then cleaned out the swarf from the knob
and inserted the led from the inside of the control,
and pushed it through so that it protruded a few mm. I added a few drops of clear glue to hold the led in place.
The control knob now looked like this.
Repeat twice more with the remaining heater controls.
Now it is easy to see which way the knob is pointing!
And why did I use old clear leds?
Because if you look at the grey background that the three control stems fit through, (the one with the switch position markings on) you will see that it is a plastic sheet, covering the clear screen of the light box.
If you remove this sheet and enlarge the holes, making sure to keep the new holes smaller than the knobs.( You will probably be able to see a definite circular mark on the sheet caused by the rotating knob - cut your new hole 5mm smaller than this marked circle)
To do this you will need to remove the centre console fascia.
Now when the instrument illumination is on, sufficient light will escape into the back of the knobs to show through the leds, and so the new led pointers are gently illuminated at night!
Tadahh!
David more pics to follow.