It won't once it has gone to game over.

It's easy to test it. Leave the match number on 0 or step it to 0. Restart the game which will reset the reels to 0. You want to score points which will not step the 0-9 unit so you close the ball chute. Then drain all the balls. The 0-9 unit will still be on 0 and so will the 1 point reel. It should match. Obviously you do all this manually with the glass off.

I don't have the schematic but if you do then you can look at the light bulb circuits and find a switch on the Game Over relay that lights the match numbers. Put an Alligator Clip jumper wire across that switch and the match numbers will stay lit while you're playing a game.

Match is 'on' (via radio plug in the back box)? And you're not maxed out on credits?

This is a good situation to use your meter since what you really want is to test all 10 possibilities. Here's the relevant part of the schematic from Soccer, but yours will likely be similar.
Soccer Match Unit (resized).jpg
The first switch on the left shows that the match is only awarded when the Score Motor is turning. And the last switch on the right shows that the match is only awarded if the Replay Unit isn't maxed out. No matter.

If you unplug the game and clip your meter onto the two wires highlighted in red you should be able to verify that the Score Reel and Match Unit are working properly together. Put the meter on the lowest resistance setting and watch as you move the Match Unit and Score reel manually. For each digit on the score reel you should be able to find one position on the Match unit where the resistance between your probes drops to an ohm or less. That's the resistance going through both units and proves that there's a conducting path through them.

So the process would be:
- unplug the game
- clip the meter in
- advance the Match unit 10 times or until you see the resistance drop to 1 ohm or less
- if the resistance drops you've found the path for that Score Reel number. advance the Score Reel an repeat the previous step
- if you don't find a position where the resistance drops there's a problem with the path for that Score Reel value

/Mark

The match unit probably has 11 connections just for the match lights (10 numbers and a common). But there's no need to unwind the specific physical connections. In the schematic above you could clip into one wire at the Tilt relay and another wire at the match adjustment jones plug and not worry about how the Score Reel or Match Unit are wired. If you can identify that there is a path through each of the 10 score reel values you're done. No wire tracing needed.