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- worth noting but i've got a rev 1 so i'm ok 
.. and a resistor, that way your boost gauge will move exactl the same until you hit the 'overload' voltage of the zenner diode.( 4.3 volt one are normally whats needed. )... not that the ECU use's the input for anything but fuel cut, once a certain voltage is reached.- that gauge is less than useless as it is!(although i'm not convinced that it's calibrated properly) so i don't really use the std gauge for anything now. There has been mention that the ECU does not use this sensor for fuelling, just for boost cut and I can say I've not noticed any difference...please someone correct me!! If your turbo fails and starts boosting to 16+psi your car won't have any safety mechanism in place to save it. I believe that is for rev3+. Rev1-2 only use this output for fuel cut so it depends how old your car is. If you have a rev3+ and your using the MBC to control fuel cut then you'll be causing the ecu to fuel for 15psi even when you running 16+ psi. Hence it will be running leaner than usual. However, due to the mapping of the std ECU that MIGHT not be a bad thing as it normally over-fuels badly. I'd want to see the result on a dyno print out before running like that tho.