Yes 10-32 and you can find or make knurled nuts (for use just with your fingers) that make life easier. Getting a socket in there isn't a lot of fun and they do not need to be over-tight.

In fact some of the aluminum ones that come with aftermarket gauges are the right thread already (or if 8-32 you can drill and tap a size up to 10-32). Otherwise I've made them on the lathe, but that's not for everyone.


1949 Chevrolet 3/4 Ton - Still Solid. Regular Driver
OT Vehicles:
1925 Hudson Brougham Super Six
1950 Chevrolet Styline (Parts)
1952 Canuck Pontiac Sedan Delivery (Well Underway)
1973 F250 4x4 Highboy
1977 F250 4x4 Lowboy