I'm with Andy Mace; I don't like dim so I went one step further. LEDs. Since I have already converted to Neg. ground it was pretty simple. I left the single filament setup in the turn signals, switched out the incandescent(s) to LEDs and then installed a relay system similar to what the boat trailer guys use. I used Hoppy™ part 48845 "Tail Light Converter". While I was at it, I changed out my tail & brake lights to LEDs., similar to what Moss sells, but I made my own. (That step isn't necessary*) You can get the Hoppy converter at any auto parts store, or order it online direct from the factory. Attached is a set of instructions for converting a 4 light TR3 using the Hoppy converter.
*If you do convert your tail lights to LEDs, do not change out the front turn signal bulbs; They provide the resistance necessary to keep the flasher unit functioning.
FRank