Hy, well its been about 15years ago that I did this. Connecting 2 VCRs to play on 1 & record on the other. This was to copy my own made vhs tapes to another Tape. I can not remember how I did this . It was either using 2 rca sockets or via the RF socket where the antenna would normally go. If anyone has any diagrams or can explain in detail how its done ,please let me know.