This adaptor is to use an aftermarket 1/8" NPT oil pressure sender (Autometer or similar) on a 1jz or 2jz block for an aftermarket gauge, it will also work on a 7M. Many people are running their 1jz mk3 with no oil pressure gauge. This is because the sender will not fit behind the ac pump on the 1jz. We came up with this and use it on our 1jz swaps. Just screw it into the block, screw the 1/8" NPT oil pressure sender into it. The male end is BPT thread.