QUOTE(FlacaProductions @ Apr 6 2024, 02:45 PM)
That's a tough one.
I've rebuilt a few of the combo gauges using lenses I found scavenging from other gauges. I've seen versions where just appropriately colored lenses are glued across the back of the gauge face - giving you the correct coloring but not the correct lens appearance. Looks pretty good, though. You can find colored acrylic sheets/rounds on ebay or amazon.
@burton73 and I talked a lot about this - to the point where he hand poured me some (that's his field) that I ended up hand-finishing and they look pretty good - but labor intensive for sure. maybe he'll chime in here.
Sorry I just trashed the small test mold I made for this.
No Idea where you can get them as a stock piece
Best Bob B