Going from memory, i think your just have to make sure you don't exceed 1800-1900 RPM.
It has a fixed pitch propeller (no pitch control) which makes it necessary to control the RPM by throttle inputs, as such it doesn't have a manifold pressure/boost gauge because keeping the RPM within limits also keeps the boost within the correct range (i don't think it's even supercharged but i might be mistaken).
Also, you need to manually lean your mixture as you climb but if you throttle back the throttle lever will "pull" the mixture lever back into the rich position. This is done to prevent fuel starvation and engine cut-out during abrupt reductions of throttle (and it's why the mixture is reversed on all the other RAF aircraft as well, making sure the pilots don't have to change habits they learned in the trainer), but it also means you'll have to manually re-lean the mixture when you increase the throttle again.
EDIT: Just checked the link above and i was wrong, but close enough...2100 RPM max continuous, 1850 RPM for cruise.
Needless to say i'm just itching to sea Flea's updated checklists, if he's got them for all flyables as he says then it will cover the documentation gap about the Italian aircraft and we might see more of them being used. Flea mate, feel free to copy over the Blenheim limits from that thread in the gameplay section
