Horizontal mount double sided stick tape far from permanent and does the job and doesn't move.
Also doesn't cover up anything like check engine light etc. which is why I didn't place it there. I know the UG will tell you but instill want it to look as factory as possible.
I also find it a lil funny before I had my sonic my friend brasschucker had a UG in his car in this same location and I though it came with the car it wasn't till I got my rs and asked the salesman about it missing the gauge that I realized it was something my friend had added. Lol
I had never heard if ultragauge and always had used aero force for stuff like this!
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