Now you know one or BOTH of those optics are no good.
You will need new optics.
You can wire the purple and red wires to a cherry switch and the MPU computer will will assume it's closed physically, when the cherry switch plunger is pushed in.
As for your other question, that depends on what bill acceptor you have in there?
The old DBV145's only took small-headed bills...not the big heads.
You will need to get a DBV-200 for newer bills.
I'm guessing also a different vented power supply for it and the enclosure and bill box.
Ask vendor/member JIM for that stuff.
He's on the homepage of NLG under Midwest Slots with a phone number to reach him at.
Tell him I sent ya.