Others may feel differently, but I'd say it's worth fixing them, and keeping the serials together. Folks may not value this now, but I think in the future more will, if these games follow in the same path as other collectibles, where originality and preservation/provenance do add value.
For me, it adds something to the game to say the numbers all match, and the parts haven't been swapped around by ops over the years. (And fully matching games, especially Tempests, are really not very common.)
That cab looks in above average shape, plus the fact that the numbers were matching suggests it has an interesting story. Maybe partly/mostly home use, or at least was well cared for.
What numbers are on the coin counters?