com unit removal help please

[amo]

hi
im having to change the indicator unit on my 406 2.2 hdi finaly gave up the ghost.ive taken air bag off and steering wheel, unclipped all harnesses now left with a circular disc type unit where air bag wires go into,its held on with 3 like tabs that ive prised open and extracted it from its housing slightly,the disc at this stage feels tight and i dont want to brake anythig.Does it just prise out or am i doing somthing wrong.
many thanks

[amo]

think its all part of the unit after closer inspection all comes of as one