First time post. On a Satoh 370D, does anyone know the type of thread for the oil pressure sender switch. It looks like 1/8" pipe, but it is a little bit smaller. I’m thinking it is metric, however, I find that metric pipe threads do not exist. There is a size 1/8" BSP (British Standard Pipe). May be someone has a manual that provides this information. Reason for the request, the engine has sat for over two years and I want to prime the oil system before start. My only access that I see is through the oil pressure switch port, therefore I'm trying to match the threads. Any help would be greatly appreciated.