So this is where I am with dim bulbs. I bought some bulbs from Holden in England,
http://www.holden.co.uk/. The part number was LLB501. It's a 5 watt bulb compared to the 2.75 watts from Sylvania installed from Superformance. I have been able to swap out the
oil temp, water temp, speedometer and
oil pressure lamps without too much fuss. I found the amp gauge and gas gauge bulb to be impossible to access using my hands and fingers up under the dash. The gauges that do have new bulbs are just fine and very readable at night.
The tach light bulb is an oddity that I can find no bigger wattage replacement for, anywhere. Anyone have any idea? Unless someone has a good layed out plan for increasing the wattage to ALL the gauges thru some rewiring of the panel dimmer, I think I've gone as far as I can.