It's the manifold pressure indicator. Check your own video, and do the same maneuver with the 1944. You reach the same speeds, which is ok, but with different UI vlues 1944 is lower.
From your initial post, I may tell you that both planes auto pitch management performs baddly. Use the manual pitch, as a workaround solution, and give thanks that it exists.
BTW... try to dive without putting thr throttle maxed after you reached 600Km/h. you will be surprised.
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