If i recall correctly, there are four bolts that hold the accy. bracket to the head/engine.
See this thread/comment with procedures to remove the power steering pump:
http://www.sccoa.com/forums/showthread.php?57981-Removing-Power-Steering-Pump&p=377807#post377807
In that photo, there is a cavity in the accessory bracket just above the waterpump brace, below the part of the casting that is right below the alternator mounting section. There is one bolt inside that cavity that bolts the accy. bracket to the head.
In that photo, you can see the flange on the lower intercooler tube that sits against the bottom of the accy. bracket. On my '90, there is one flange on each of the upper and lower intercooler tubes. I recall some early models have a 3rd mount point, making it 2 on the lower intercooler tube and 1 on the top. If you remove 2 and either tube won't come free, look for a 3rd. The (2) fasteners on my car come in from the side. On my '90, the upper is a bolt and the lower is a nut on a stud...that's the one that is square on the end to it can be removed along with the nut if desired. That's the way i did it on my car.
These images show both pass. side and driver side accy. brackets:
This image shows the lower intercooler stud/nut:
This images shows the intercooler tube(s) out of the car so you can see both mounting points:
Note that replacing hoses and seals on the power steering pump require at least one Ford teflon o-ring. Search here for details on part number, etc. As for the pump, their are kits to do them, but I would just replace the pump so everything in there is new...this is not a job you want to do twice. Don't forget to re-seal the intercooler tubes when going back together, there are many threads here on how to get that done as well.
In your example now, I would focus on refreshing the pump, it's hoses, seals, o-rings etc. as the main task, which will result in parts, including the accy.' bracket, that will open that area up and I think make it much easier to get to the oil pressure sender as part of the overall process.
Good luck.