I recently bought a set of gauges, pulled the bulbs....WTF!....wires soldered to a bulb, directly from Autometer....
I commenced to going off on a tangent!
Then I had a idea....Vacuum caps! Got 3 vac. caps that just slide in supertight, got a drill, put a hole into cap, pushed in a superbright LED, gauges now look great! Just a touch of silicone to seal out elements.....
And yes, you can dim LEDs....