caperbility

Could any of you good people suggest anything i could use to stick my diagnostics meter to the top of my dash in a classic. I was using double sided tape or number plate pads but with the dash not being smooth they wouldnt stick! Obviously i was after something that wouldnt leave a mark so i was wondering if i could use something like a rubber solution glue that would peel off if i ever wanted to remove my gismo. What do you think?