just found out the fuel sender i got from what use to be chevy duty in parkville,mo is per original spec. 0-30 ohm which will work with any chevrolet truck fuel gauge up to 1967 which is when gm switched to a 0-90 ohm sender and gauge. also the sender is not voltage particular when it comes to having 6 or 12 volts. my original gauge was already toasted, ill get by for now with a 63 truck gauge i have laying around, at least i wont get stranded.