How to get hydralics from trany

bought it in 1973 just repainting but now I am getting old and need hydraulics for the blade.Its a 12 automatic
the transmission shiftier is between your nees and has a bypass vale at the left heel of the operator turned by a screw driver
the numbers on it are hard to read looks like 2-25 and 7090124. It would be nice to know the manufacture and where to tap into it.
Thanks for any help.

Thanks Gino for the quick reply.My Horse only has Automatic on it not Charger The picture looks different on the left end of the casting it looks like the relief valve for pushing is on the top where mine is on the same side but at the bottom front and is turned with a screw driver
My horse cerial # is937385
model10465 8
Also I fond a tag on the trany
model 90-1136
serial # 03- AA 128242
Wonder if anyone could give me a measurement on the cylinder length.
Thanks for the help much appreciated

its a sunstrand trany