ps 2 3 volt boards are the same board for diesel or steam just different sound files but ps3 boards are different then steam diesel board are true ps 3 boards ps 3/2 boards are for replacing ps 2 5 volt boards that have failed and are a excact replacement except you have to replace the speaker from a 16 ohm to 4 ohm speaker for ps 2 3volt boards and ps 3/2 boards are also 4 ohm speaker !
Alan