FYI....I have a Sigma here that I am working on for a client...I have tried both settings of the dip switches mentioned above...Every time I change the dips, the machine works perfectly...If there was a wire broken or the meters missing the display would tell you that so you could turn off 2-10...As far as 1-4, that is for credits and how they are used...Does not make any sense that the machines would start working by change those dips unless by changing them reloaded the game software and then started to work..Not saying that mustangjeep is wrong, I am just pointing out what I have found...