found the bulbs
I e-mailed geno's garage and they had the bulbs. I've ordered a box of ten in case they don't last any longer than the originals.
In Big Saints post he has a link to another thread on the subject of these bulbs. Drawson referenced bulb #37. I found these at NAPA, but they are not the bulbs that were in my gauges. They were 12 volt 2 watt, but the base was different. I wonder if Di Pricol has changed sockets, or if they use more than one type.
I don't know what the number is for the bulbs I ordered, but I will post it here when they arrive.
Meanwhile, I temporarily rigged a white LED from Radio Shack into the base of one of my originals so I would have some light in the boost gauge. N0t bad, but not perfect. It has a bluish caste and directs most of the light forward in a cone, but serviceable for now.
Thanks to everyone for their help.