I've got Report No. 263 -- nothing on boost, but it has a comment on the engine speed indicator:
The rev. counter is marked at the following points:
(1) 2,400 r.p.m.
(2) 2,700 "
(3) 3,000 "
(4) 3,300 "
which indicate, presumably:
(1) Econ. cruising
(2) Max. continuous cruising
(3) Climb and combat
(4) Max. emergency
Re: MW 50: '
The rear self-sealing tank is fitted in the same position as, and is interchangeable with, the methanol-water tank.'
A summary of crash reports from the 1 January 45 action said: '
The majority of the aircraft carried an extra self-sealing tank of 115 litres (26 gallons) capacity in the fuselage, the size and position of this tank corresponding to the more usual MW 50 installation.'