The FNA oil pop top is used as an oil pressure indicator. It will install anywhere an existing oil pressure gauge is with a standard 1/8” npt hole. You can get rid of that ugly dial style gauge or indicator light pressure switch and replace it with this stylish part. At around 30psi the FNA oil pop top is fully extended at about 1/2” sticking out. All polished stainless construction and 100% made in USA!! We are making an adapter to fit a few different engines, so keep yours eyes peeled for those to come out soon!! Patent pending.