To allow you to view your preshared keys on your PIX ASA use the command `more system:running-config`. 

You can also view the preshared password with some versions of ASDM. Below shows the example of the command.

pixfirewall# show run
!
tunnel-group mytunnel type ipsec-ra
pre-shared-key *
telnet timeout 5

Your preshared key .....

pixfirewall# more system:running-config
!
tunnel-group mytunnel type ipsec-ra
pre-shared-key MYPRESHAREDKEY
telnet timeout 5