Use Tailscale+mullvad as tunnel for opnsense box itself

[Magician1981]

Hello,

Please help me with the following. I am running opsense baremetal and have installed tailscale+mullvad addon. I want my opsense box itself to use the mullvad connection for internet traffic instead of the normal connection so that for example system updates only go through the tunnel.

This is the current public ip (redacted):

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root@OPNsense:~ # curl https://am.i.mullvad.net/connected
You are not connected to Mullvad. Your IP address is 31.xxx.xxx.xxx
Tail scale docs do no provide a install guide to enable this. In opsense webgui it does say this under advanced:

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Route traffic to the specified exit node. Note that this only affects traffic routed into your Tailscale interface, which you will have to configure separately using firewall rules and hybrid outbound NAT rules.
So can someone provide me with step by step guide please?

Thank you.