Manometer -- determine height from relative pressure

daphnelee-mh
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Homework Statement
A Burdon gauge is mounted on the top of the vessel at point M . The relative pressure at M is -980Pa, determine h1 if H=1.5m, h2=0.2m
Relevant Equations
Pm=Pa- Pmabs
The correct answer is 5.6m, not sure where I made the mistake.
077D3BF0-F540-46C9-897C-3D3512AD5509.jpeg
 
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##P_{M gauge}=P_{atm}-P_{M abs}##?
Doesn't look right to me.
 
I get ##P_{Mabs}=p_{atm}+P_M##
 
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