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There's four filament T-4 socket bulbs for dash lighting that you can get at the chain stores. They work with the dimmer, are pricy, and burn out fast with higher voltage. Same old obsolete bulbs. You can use them and then keep the rheostat down and make sure your voltage regulator isn't going above 14.1 VDC. There are some cheap T-4 LED replacements that will be immune to high DC volts and vibration, but probably won't work with the rheostat/dimmer.
I have some here but have not tried them in the Instrument cluster.
They work great in the License plate, More light, better color: white, and way less DC current. My guess is the T-4 LEDs used in the license plate sockets will be too bright for the dash lighting, maybe not. I suppose someone will lead the way and find the LED replacements with the right lumens to be acceptable. While the Instrument cluster is out: You could easily play with durable and long lived LEDs in the Instrument cluster on the bench by hooking up 12VDC and seeing if they are the right brightness. I dunno if they have LED replacements that are dim-able, maybe.
It can be that the perfect LED is available now, try www.dx.com for a huge up to date selection. They are cheap enough to order by mail, you just wait a week or so.
Post back with any findings.
Bill
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