I just did the install on my Z, this video helped even thou is for a different booster
https://www.youtube.com/watch?v=qQsH__7oa7I . I used a box cutter blade to separate the cover from the base and used a sharp edge screwdriver once I had space for it to fit and after a few tries it came off. The connectors are a little tricky since there is very little room to work under the dash