You can go one of two ways. The easiest is to use a spectrum unit remove it from the metal box it's in and mount it in the player tracking area. Check this link
http://newlifegames.com/nlg/index.php?topic=4863.0The other would be to use a mikhon stand alone controller.
You would need the controller ( cham IIplus) display and power supply. This set up will also require loading the controller information via a PC that has PSP software. You would also have to make a connection cable.
There is much information under this topic you can review.
Spectrum is a relatively quick set up.
Mikhon you can also have a scrolling message displayed along with the jackpot total.
Rich