you can get a coin mech to accept using just +12v and common,if you look at the label on your mech it should numbered 1 to 16(depending on version),its the pinout of the plug
1-coin common
2-coin 1 accept
etc
you will see +12v(might say Vcc) and common,these need to connected to allow the mech to accept BUT sentinel mechs were bloody awful to be honest and even when they accept they don't always credit-i think you would be better off just getting a mechanical mech,if you go ahead with this mech then i would strongly suggest getting a klingon credit board-the wiring is simple and they plug straight on to the sentinel(you only need 3 wires +12v,common and credit line/coin switch)
you can use +12v and common for your coin bulb(as long as its a +12v bulb that is)
you can pick 12v and common straight up off a standard p/c power supply(yellow +12v,black common)