Oil change FM57 gearbox

[mEnkvist]

Hi,

I?m confused. Planning to do a oil change on my 5 speed manual gearbox (FM57) but cannot find any fill plug...
Should be located on top of gearbox, all I find is the reverse sensor.

What to do? Can I fill new oil by removing the sensor (Nr 1 in the picture)?



Or, what is Nr 2 in my picture? There is some rubber protection which when removed reveals a hose connection with a small hole (but not very likely to pass any oil...)

[mEnkvist]

Think I found it. According to Saab Wis Online there is a version of the 5 speed gearbox without filler plug.
Oil can be added by removing the reversing light switch