Found and installed: Credit/Ball Display for Williams System 7
This is the one where the ribbon cable plugs on the left side. The 4 character one, not the 6. A little burn OK, but hoping to find one left over from a VP project.
It’s for a Firepower II, but comes on several games.

Algar
Alien Poker
Barracora
Black Knight
Comet
Cosmic Gunfight
Defender
Firepower II
Grand Lizard
High Speed
Hyperball
Joust
Jungle Lord
Laser Cue
Laser War
Pharaoh
Pin*Bot
Road Kings
Solar Fire
Sorcerer
Space Shuttle
Star Light
Thunderball
Time Fantasy
Varkon
Warlok