Using serial console to instead of a gfx card
I've building my own pfsense box using a matx with I3 9100.
Due to PCI-E slot availibility and lack of onboard gfx am forced to use my x16 slot for my 4 port nic.
It's always easier when you can physically see what's going on with your pfsense box hence you need a gfx card.
Is it possible to us my serial port to watch my pfsense box post (i.e. bios to pfsense) as if it was a monitor plugged into the pfsense box?
Yes, just enable serial console in Sys > Adv > Admin Access.
However you board may not boot without a graphics card or it may require some BIOS setting to allow it to do so.