2014 case not compatible with force touch trackpad. The best value is to replace the keyboard.
here is a guide for the keyboard
[guide|77657]
here is the part you will need.
[http://www.ebay.com/itm/NEW-Original-APPLE-Macbook-Pro-13-A1502-Keyboard-US-2013-2014-Retina-backlight/252900215564?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D40130%26meid%3Dfe18d8876c5641d292601c4a29273496%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D272311248555]
battery removal here-
[guide|77660]
you will need these pliers
https://www.amazon.com/FastCap-PLIERS-FLUSH-CUT-Flush-Trimmers/dp/B001MXA2BQ