It may be easier to get the rest of the game working before replacing the missing Credit Unit. That would let you solve smaller problems one at a time. Splicing in a Credit Unit from another game might not be as straightforward as matching wire colors especially if you don't know which game the replacement came from.
I think the only connection you really need from the Credit (or Replay) unit is this one:
Dipsy Doodle Replay Unit sw (resized).jpg
If you can find the two wires in red and tie them together that will allow the Replay relay to fire which should allow the game to start. In fact it may be the very connection someone has already made to your game. You'd want to double check with a meter to verify.
Quoted from DV8R:outhole and kicker staying energized once switch was made and keep on firing untill game is shutoff or reset relais is pushed.
Does the Outhole relay release once the ball has been kicked to the shooter lane? If not check the lock in circuit in red:
Dipsy Doodle Outhole relay (resized).jpg
The Make/Break switch on the Score Motor should open to cut power to the Outhole relay.
/Mark
