37240-ZG3-E01 Oil Pressure Switch - Overview. The 37240-ZG3-E01 Oil Pressure Switch is a critical component within Honda marine engine systems. Its primary role is to monitor the engine oil pressure and provide alerts or initiate shutdown procedures when oil pressure falls below the safe operating threshold. Designed specifically for Honda marine engines, this switch plays a vital role in protecting your engine from damage due to low oil pressure. Manufactured to meet exact factory specification