May help some Newbies - like me ...

You Tube

 

At just over the 3:00 mark, the gentlemen mentions using a butter knife to wedge between the gauge and the dash vinyl. I used a piece of plastic "sheet" cut from a reusable food storage container. This way I was able to address a much larger section than that obtainable with the butter knife

 

I used a thin cake froster knife.

 

Well, this makes me not as concerned about figuring out of my tach is accurate 😅