Check that you also have both scopes and target scopes set properly (they may not show if they are default, but IMHO better make them explicit) and of course you only need to monitor first (main) connection, simply because you have not a third one to failover to.
if you prefer:
IF first connection is up -> nothing to do
IF first connection is down -> switch to second connection
THEN:
IF second connection is up -> nothing to do
IF second connection is down -> nothing to do
In case of need:
Simple recursive failover for bears of little brain
alternative (using netwatch instead of recursive):
Simpler Failover for two Gateways I found working - #19 by jaclaz