Tailscale is an overlay network. It will use whatever networking is available. If only one of those NICs is a gateway, then that’s what will be used to reach remote Tailnet resources.
It's Wireguard, so you'd just change the Wireguard profile to use a specific interface. The routing between the two networks is handled at the routing table, and all will be available to route to.
Thanks for your answers. I wasn't able to get what I wanted to work but that's because the device used broadcast for discoverability which doesn't work through subnets. I pivoted to something else
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