Did this to my Tacoma a few years back and got around to the T4R today.
These are available commercially:
Amazon.com: Accu-gage - Chek A Spare, Valve Extender: Automotive
You also need a Hood Support clip. There are lots of 'em out there. My dealer had PN 53455-33011 in stock.
I mounted the clip here:
I used this to drill the hole. Just went up a step at a time until I had it right.
Attach the extender to the spare and clip it in place:
Invisible from above, but just reach under and unclip to check or add air:
These are available commercially:
Amazon.com: Accu-gage - Chek A Spare, Valve Extender: Automotive
You also need a Hood Support clip. There are lots of 'em out there. My dealer had PN 53455-33011 in stock.
I mounted the clip here:
I used this to drill the hole. Just went up a step at a time until I had it right.
Attach the extender to the spare and clip it in place:
Invisible from above, but just reach under and unclip to check or add air: