Disable SIP without recovery mode Before you respond that this isn't possible, hear me out. I have a Mac Pro 4,1 (with 5,1 firmware), running MacOS Sierra. I want to disable System Integrity Protection (otherwise known as SIP), but have run into a snag. I don't have a flashed graphics card, so I can't see my boot screen (or recovery mode or safe mode) on my computer. Therefore I can't see how to disable SIP on my computer. I have tried:

Boot Mac Pro into target disk mode and connect MacBook Air (OS X 10.9 - pre-SIP) via FireWire To MP. Boot MBA from Mac Pro's recovery partition, (MacOS 10.12 recovery). Disable SIP, reboot. Doing this worked on the MBA. But when I turned on the Mac Pro again, SIP was enabled. I assumed that because of this, the SIP disable was linked to the hardware.

Question 1: Is this assumption correct?

Question 2: is it possible to disable the SIP without using the graphics card in the Mac Pro? I have an iMac running MacOS Sierra and a MBA running OS X 10.9 at my disposal. Possible solutions can include (but don't have to be limited to): ssh, screensharing, target disk mode).

I would appreciate any help. Please post questions as comments and feel free to suggest edits. Thank you!
Edit: to answer your actual question, you can't do it from anywhere except Recovery Mode, so anything you do must be done from there.

Tested on a similar 4,1 upgraded to 5,1 [but I have a flashed graphics card so I could see what I was doing]

Reboot &amp; at the chimes hold  Cmd ⌘   R  for about 10s.
Wait until you get to Recovery Mode, which for me took approx 45s from the chimes [I'm on SSD but I think it may have chosen a Recovery on another HD to actually boot from] Give it a minute or so just to be safe.

 Fn   Ctrl ⌃   F2  will switch focus to the menu bar, specifically the Apple logo, top left.   

It appears that whatever you have set in System Prefs > Keyboard for "Use all F1, F2 keys as standard function keys" that this option is disabled in Recovery, so even though just  Ctrl ⌃   F2  works for me in a running OS, in Recovery I needed the added  Fn  key.

From there, you can navigate using the arrow keys 

Pic from https://apple.stackexchange.com/a/254167/85275

 

From that you can see that Terminal is 4 to the right, then 4 down.
It's 4 not 3 because the first down arrow opens the menu.

Hit Enter &amp; Terminal will launch.
Type csrutil disable &amp; hit Enter
Type reboot &amp; hit Enter.

If it reboots, you got it right - otherwise you'll have to have another guess.

BTW, golden rule, as you have discovered, is keep your crappy old stock Apple card somewhere safe, for occasions such as this ;-)

Additional note:  Fn   Ctrl ⌃   F2  is a toggle. First will select the menu bar, second will deselect, so make sure to only do it once.