Here's a forum post on the AK files forum where a guy disassembled this scope and replaced the tritium element:
The AK Files Forums - Romanian PSL scope, wheres the tritium?
It appears you can cant the reticle yourself as it's in a 'twistable' section of the scope. Also, here's a section on dragunov.net that has the pictures and short description of disassembly from that forum thread if the pictures don't show up:
Dragunov dot net - Romanian LPS Rifle Scope
good luck! I have this exact scope on a PSL and it's dead nuts as far as holding a good zero for the rifle. Trick is finding good ammunition that isn't surplus garbage!