I I used some spray adhesive. SIA 65 as recommended by a guy at hardware store (a REAL one NOT Lowes or Home Depot). ....
So, it worked really well, this spray was great, I gave the dash and vinyl a pretty heavy coat, waited about 10 minutes until if felt dry and stuck 'em together, I was a tad off the mark, more puckers around the edge then I hoped for but not as bad as I feared. Glue grabbed amazingly. Pulled over the edge and pressed it down and it held. Hopefully it's "tight" enough. Looks very good so far.