Removed the manifold transducer to rivet the subpanel rib (F-745-L) to the firewall. Used solid rivets, pulled rivets and AN3-5 bolts to secure the rib and manifold transducer to the firewall. Had to use the pulled rivets due to the inability to reach the two lower holes. Used both the hand squeezer and pneumatic squeezer to reach the other rivets.