My '48 GMC originally 6Volt with positive ground has been changed to 12V with negative ground and has an aftermarket gauge cluster. Going back to an original cluster I know I can add a 6V inline resister to the gas gauge but will the change in ground from + to - be OK for the gauge? I do have a Chevy gas gauge that is from a negative ground truck that I could always substitute if the original GMC gauge won't work.

Thanks, Jim