tvmaster
True Classic
Factory lamps (big bulbs) were 158 3.4 watts. There are four of those in the cluster. Do you see a heat, or current draw problem upping those to 5w incandescent bulbs? I’ve pondered low wattage LED’s there, but as you say, the two-position selector switch may be a problem, and I don’t want to get into splicing resistors in and all that.I would be surprised if the two position instrument cluster light switch has enough series resistance in the low position to significantly dim LEDs. However, the rheostat is wired as a voltage divider, not a series resistor, and that could dim LEDs. That's why I would replace the light bulb/fiber thing with individual LEDs in the console switches and the heater ideogram if switching the instrument panel to LEDs. Then you could use the dimmer for everything.
The smaller 1.2w bulbs aren’t actually noted in the owners manual (unlike the 158’s), and there are NINE of those to replace