Rit Dye may work, I've dyed a couple of new grey plastic Traxxas parts black so they look period with the rest of the Bandit.
This is my ride for Friday, the newly rebuilt TL01:
PS: The old Mtroniks speedo in the TL01 failed and the motor wires came dislodged as well... who know how or why. I think the motor wires was my kids doing and the ESC just plain bad luck or the TL01's curse that as soon as it sniffs racing it starts to play up... It worked great as a drifter for MONTHS!
Anyway, I have enough brushed ESCs at home to last me the whole summer.