Basically use bondo/fiberglass to strengthen/rebuild the mounting tabs, as well as the whole backside of the dash. The problem with our dashes is more than just those 4 tabs. If you push/pull on any of them, you will see a large area around them begin to flex.
Adam gave me the idea, and my dash is completely solid now. Probably for the first time in 15 years. I forgot to take pictures of the process, here's adams writeup.
The metal tab method a lot of people do/used to do does absolutely nothing, because the plastic still cracks, and theres still stress in the rest of the dash.
https://www.amazon.com/3M-Fiberglass-Resin-Repair-Pint/dp/B000BO9NOO/ref=sr_1_33?ie=UTF8&qid=1479871227&sr=8-33-spons&keywords=bondo+fiberglass&psc=1
I used two of these.