Manometer -- determine height from relative pressure

[daphnelee-mh]

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.

 

[haruspex]

$P_{M gauge}=P_{atm}-P_{M abs}$?
Doesn't look right to me.

 

[Chestermiller]

I get $P_{Mabs}=p_{atm}+P_M$