My '46 is no where near stock but I like the look of original gauges so I have changes a couple. All 12 volt, oil pressure ga. from a GMC goes to 60 psi and bolts right in. After market can re-do your gauges to look stock but have a speedo to 200 mph or what ever.
http://rides.webshots.com/photo/2057553560102242071mgvNzH


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed