I have several sets of each of the following.
1. Suizo Happ LED light sticks for the IGT S2000. these are the nicest I've seen. Plug and play. Bypasses the troublesome ballast units. set of 3 $35 All Led light sticks are sold.
2. Bill validator display. These are the ones that light up the denomination of the bill you put in. $25 BV displays are all sold
3. Simm based software for the 3902 Game King. Better graphics with the sim software. Jacks or better, double bonus, double double bonus, deuces wild, joker poker, bonus poker delux, super ace bonus, white hot aces, super double double bonus, double double bonus plus, aces bonus, triple bonus plus, super double bonus, triple double bonus, aces and faces, double ace face, double double ace face, shockwave, double deuce, loose deuce, deuces bonus, deuces double bonus, deuces super bonus, one eyed jacks, deuces joker, double joker, ace deuce bonus, wild 7s, aces and eights, usa poker, and variations of the above pokers 54 pokers in all. also includes blackjack and bonus blackjack, spot keno, caveman keno and the ever popular multi card keno. Base rom is 944. base simm is 1113. $35