Dave,
Thanks. I think you might mean 2-5/8, that is the standard size, i don't think anyone makes antything in a 2-3/8". We do have some 2-5/8" base gauges that we use for custom applications. They are mechanical and we custom build them to order. We really just need to know what you want to get going. We do custom dials, pointers, pretty much anything, at a price that isn't cheap, but probably alot less than you might think.
Mark