If you would like to improve the brightness of the display this is how you can do it.
On the inverter board, there is an 18 OHM 1 Watt resister. ( R3502 ). Replace this resister with either two 10 Ohm 1/2 Watt resisters, in parallel, or one 5 Ohm 1 Watt resister.
The result will be as follows.. your dim will now be what your HI was. Hi will be brighter, but not too bright. A more pleasant looking display.
DO NOT jumper the resister as you can cause components to fail on the display board from over heating.
The original resister drops the 13V dc down to about 10V dc. The new resisters will only drop the voltage to about 12V dc.... There are NO heating issues from this mod. ONLY a much better display...
I make NO guarantee with this mod, do it at your own risk..