Attaching a Worksaver Post Driver to Kubota L2550

[LeeRoy]

The post driver requires the return line be attached to the transmission fill port, not the tractor return line. The post driver control valve can be set for open or closed center operation. What is the best way to plumb the pressure side of the post driver to the tractor. I have a FEL with quick couplings on the carryover(bypass) FEL valve. I have connected this way, but I lose my TPH. Can I Tee into the carryover of the FEL line and use closed center on the post driver valve.