I dont know what do u mean by optitron meter. BUT
Saloon 2002 to 05 and Altis old shape, Speedo meter lights can be adjusted. You better do it in the evening or night time. You will feel clear difference.
Switch on you car or start your car
Trun on the parking lights or your head beams
and then adjust with the same KNOB which we use to adjust TRIP meter.
hope it would work