Heya,
Lately i've been having problems with the inboard dash lights (behind the speedo, fuel gauge, etc). It SEEMS to have something to do with how many revs the car is running at. Sometimes if i throw it into neutral (at around 1000RPM) the lights will come on, but when i chuck it into drive (drops to 700-500RPM) it'll die. Same thing happens if i rev it. But its also not consistant in that fact. Sometimes the lights just won't turn on until 10 minutes into driving the car at a consistant speed.
I just can't nail it on the head, any ideas?

Could be the alternator starting to fail. What happens when you turn your headlights on, does the same thing happen with the brightness of the lamps, low revs slightly dim, high revs normal?

Check the tension of the alternator belt in case it has a little slack and is slipping. I'm sure some other members will have ideas.