Not brilliant, but cool. I only figured it might cure the fogging while waiting for the LEDs to arrive, which I thought to use for the purpose of more light, not to eliminate the fogging.
Additionally, the speedo and tach were not quite bright enough with the LEDs, but I had the inside of the rubber casing sprayed with gloss white paint, and that did the trick.
Also, one of the light sockets on the tach would not take a 4-LED too easily even with some minor modification, so I used a 1-LED which is slightly smaller and fits well.
I see no difference in brightness from the speedo which is using 2 4-LEDs.