I had that problem with not being able to see the gauges at night.
I took the gauges appart and painted the inside of the cases with white paint and reassembled them with the same lamps, and now the faces are bright and easily seen at night.
Worked for me.
Cheers,
Bryan
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COB-66 Young at heart old fart.
Don't drive faster than your guardian angel can fly.
If it doesn't matter what gear your in you have enough torque.
VK3KDN