As far as the truck, I used 3 led’s in series, with a 9 volt transistor type battery, It was a 100 ohm resistor, and a 270 using the led calculator, the hardest part on the pickup was the headlights as this was a smaller scale truck (none are easy!) I used a teeny drill to pop out the head light bezel, on both and drilled out the taillight hole with the proper size for a 5mm led, 3mm would work better but I only had 5mm’s. Just hook em up the way the calculator (link below) shows and then put a slide switch wherever is easiest for the project and a battery clip, and hook up your 9 volt. Not easy but not that hard. Hardest part is drilling out your headlights so the led will fit in it without destroying the headlight housing, I would use 3mm leds and I did use 22 guage stranded wire something smaller may be easier. I’m learning as I go too on each project. If you like bright like I have use bright white, some of my mentor’s have suggested warm white its whatever you like the look of. If I can be of any further help let me know. On my little farmhouse I used 3 leds, and the train station has 4 batteries one for the street light, 1 for the 4 warm white led’s, one for the two lamps in fixtures on the inside, and one for the two outside lights over each door. 4 switches Regal
http://led.linear1.org/led.wiz