I have been pondering the implications of both instruments.
Climbing to critical altitude, whilst maintaining constant MAP (i.e. absolute pressure), the back pressure on the exhaust system is decreasing, as is crankcase pressure and thus the force on the bottom of the pistons.
At the same time, ambient temperature is dropping, for greater air density at the same MAP.
I read these two factors as a gradual
increase in power during the climb.
On the other hand, a Boost "gage" (Yankee spelling) would tend to even out the first of these factors. I've never flown a Boost engine - maybe someone can expand on this.
