I pulled this out of my Twin Turbo project to show what a fully assembled and functional MS2 looks like.

(helping an ad in the classifieds)

Not all of the resistors are used when configured certain ways... the assembly manual reads like a "choose your own adventure" book in some spots. The particular board for sale might be configured for less features than what I am using for my Twiin Turbo car (that wants MORE that what I'm using with the fully loaded board)