I am pretty sure there were two small bulbs in the compass, one will light it up enough, but there are two. it is a bit of work to take it all apart and you have to be careful, but if you take your time it isn't too bad. that is why I would do both bulbs, at least on my 97 and my dad's 99 there were two bulbs in the compass, one on each top corner.

97 Montero SR w/Mitsu Adj Shocks & Rear Diff Lock ARB Front Diff Lock 4.9 Ring/Pinion 3.15 transfer box 43:1 crawl ratio 2" suspen lift 2" body lift 2" Gas Tank Lift 35x12.5 MTRs 15x10 Wheels Rock Sliderz ARB front bumper w/12k winch Custom rear bumper