In case anyone else googles this as I did when I recently purchused a Dell Venue 7140 (basically same as 8 just bigger): it is possible to add pressure sensitivity without a "proper" driver.
Locate the Photoshop Settings folder (you need to enable hidden folders): C:\Users\[User Name]\AppData\Roaming\Adobe\Adobe Photoshop CC\Adobe Photoshop CC Settings\
In this folder create a text file called PSUserConfig.txt containing the following:
# AllowRTS uRTS 1
Voilá! Pen pressure will be recognized next time you start Photoshop. Works flawlessly for me!