When a cruise prop is installed on a C152, one of the requirements is that a placard be displayed on the panel showing the minimum static RPM is 2100 and that the max continuous cruise RPM is 2440, as both figures are at odds with the AFM.
As for the checks during the takeoff roll, I can't imagine why you wouldn't check the gauges - particularly in a low performance aeroplane like the 152. EFATO is not my idea of fun, and if a simple 5 second check can help avoid the situation, it's worth it.