Hi .. If this is the secondary firewall .. then you only need to configure basic failover settings on it and once the firewall is connected to the Primary then the configuration will be synched.
You only need to make sure the failover configuration on the Primary is correct and that both PIXes are running the same code.
Once connected then you can do a show failover to see the status of the failover. whihc should show normal on the interfaces.
Please see the below link for more inforamtion about failover configuration.
http://www.cisco.com/en/US/products/ps6120/products_configuration_guide_chapter09186a008063b31a.html
Now by only looking at the config I belive your globa NAT needs to be changed to
global (outside) 1 198.137.151.225 netmask 255.255.255.255
I hope it helps .. please rate it if it does !!!