what in the blue blazes are you trying to do?
You aren't supposed to need to "add air" to anything in the LS400 except the tires, and there is no provision to externally fill the factory air suspension tank.
1. Black on Black 1999 LS400 PM-spec
-Platinum VIP-Figs Engineering
2. 1989 Toyota Supra white package
Current Status: -500 Internal System Error-
3. Black 2004 IS300 -Manaray-HKS-Eibach-
4. Ebony Teal 1995 LS400