is there a fix for speedo reading too high?

[PLP]

I also see the displayed speed being high. I would prefer it to be on spot, or maybe just a tiny bit higher, as with the knowledge I am doing 50 mph when I see 55 mph gives me stupid ideas and sometimes I am lost in the math.

I will be OK going 72 mph in 65 mph zone, so it means I need to drive 77 mph... you see the point?

I get the general idea, but almost 10% is too much.