There is a set screw lower on the knob, pointing forward (IIRC, it's a torx screw - sorry - don't remember the size - I want to say T10). Loosen it until you can lift the knob off. Once you loosen it just enough for it to be removed, only loosen the screw a tiny bit more to ensure that the knob really is free to move but not enough that the screw falls out.
When putting the knob back on, once it's on the shaft, tighten the screw just enough to drag, and you will feel the tip of the screw 'fall' into a hole in the shaft as you move the knob up and down, then, with the tip of the screw in the hole, tighten her down good and snug. The hole positively locates the knob to its proper height so there's no guessing.
'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs
Last edited by peva; 05-14-2011 at 11:05 PM.