I have a Series III style dash.
I used a very similar self adhesive LED light strip under my upper dash and lower dash. The result is light in the cubby areas and the floor boards. I bought my lights from superbright LEDS web site and chose an "antique white" color to try to keep the light more in keeping with the older vehicle.
I wired the lights to the dash light switch that I replaced from a two position switch to a three position (headlight / heater fan) switch to keep the dash looking factory.
The whole job cost about $15 (I had a spare switch in my junk pile). I am super pleased with the result.
Firemanshort
1980 Stage One
(Past owner of 1973 Series III - Highlander)