This OBD II cable splitter will allow you to split our one OBD II port into two accessible OBD II Female ports.
16 pin OBD2 OBDII Splitter Extension Cable Male to Dual Female Y Cable
Features: OBD II cable splitter, signal splitter. Allows two devices to be connected simultaneously. High-quality materials give the cable superior flexibility and durability. Compatible diagnostic tools with a 16 pin socket.