Headlight/Tail light circuit should be 12V. Might even have a 12V lead in the brake lever switch you could tap into. I would leave the headlight alone personally. You can always stand to loose the tail light but at night it's the headlight that gets you home.
-------------------------------------------
Shhhhhhh...... Someone's coming
-----------------------------
I think.... therefore I sled
-----------------------------
Two '94 Indy XLT SKS
-------------------------------------------
Shhhhhhh...... Someone's coming
-----------------------------
I think.... therefore I sled
-----------------------------
Two '94 Indy XLT SKS