Set priority between 2 interfaces by Failover

Hi Dear All,
I am using mikrotik Router Board rb951g-2hnd. In PPP list, i have 2 active connections, one is ppoe-out1 which is to dial out my isp line, and another is ppp-out1 which is to dial out mobile internet (By usb Dongle). Both are working fine. Now i want to set priorities to the connections. Like, both connection will be enabled, But ppoe-out1 will be the default active connection. When ppoe-out1 will be failed to connect to the internet, then ppp-out1 will be dial out and connected automatically. Moreover, When ppoe-out1 will be able to connect the internet again, ppp-out1 will be disconnected automatically and RB will use ppoe-out1 as active connection again!
RB Interfaces.jpg

You can try and use netwatch.
If the main connection goes down then it automaticely enables the backup tunnel.

As soon as the primary tunnel reconnects then it disables the backup one

Thanks for your valuable reply sir. Can you please refer any tutorial/article how to use/configure netwatch??