I used to have the adapter hose. I can look next week. It replaces the high pressure line from the firewall to the engine. It has an inline T with a schrader valve to check the pressure. Someone could make one themselves by splicing in a T and a schrader valve.

Mitsu # 6 - 98 6G72 Montero Sport, R D Lock, 31x10.5

Mitsu # 7 - 02 6G74 Montero Limited