Monitor VPN Tunnel

I'm trying to use the Custom MIB Poller to monitor the status of a VPN tunnel on a Cisco ASA.  Has anyone figured out how to do this?  

I've found the following OID in the CISCO-REMOTE-ACCESS-MONITOR-MIB but the Custom MIB configuration wizard only lets me enter the first portion into the system.  It appears that the OID is made up of the OID plus a three digit number which is unique to each tunnel.  Thus, I cannot enter the ??? portion of the OID so as to look at that particular tunnel.

1.3.6.1.4.1.9.9.171.1.2.3.1.7.???

Any ideas?