How to make Wireguard VPN input and output traffic on different interfaces.

wireguard.sh

## This will work with installation made by this script.
## https://github.com/angristan/wireguard-install

echo "100 wg" >> /etc/iproute2/rt_tables  ## Create new routing table
ip rule add from 10.66.66.1/24 table wg   ## Send all traffic from Wireguard network to wg routing table
ip route add default via 192.168.1.1 dev ens7 table wg  ## Set default gateway for wg routing table
iptables -t nat -A POSTROUTING -o ens7 -s 10.66.66.1/24 -j MASQUERADE ## Make it working with Wireguard NAT

## Also you could try something like this.

ip -4 rule add pref 500 from 10.66.66.1/24 lookup 2 ## Make all trafic from Wireguard network go to table 2
ip -4 route add default via 192.168.1.1 table 2 ## Set default gateway on table 2

## Do not forget to make script to set this changes on your system startup.