well not really the gauge, but i wnt to az today and got a nos brand gauge, it had the manifold with it also, well i get home and the bottle bolt "nos brand" is to big for my bottle, and my stock nut, the manifold wont fit into it what can i do

 

buy the manifold that fits. do u mean bottle nut (bottle bolt)? i have a 4an bottle nut on the end of my bottle and i bought a gauge that came with the 6an manifold so i went to a performance shop and bought the manifold -4an manifold that fits a guage and has a 4an male tip on the other side for the feed line. fyi most street nitrous kits are 4-an fittings.