The DTM overlays are great! They fit perfect, and so far have held up really well for me. I actually sent a few different rallye dashs back and forth with Jim, the owner of DMT, to get the lower overlays made up for my dash.
This picture is from the original installation in November of 2013
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From September of 2020 when I added the console. They're still great, but that's apparently the last picture I took of the dash.
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Mine were not adhesive backed, I glued them on myself with an epoxy type glue. The dash overlays I got back in 2013 though. The console was newer than that, probably a few years ago. But also not adhesive backed.