[Tf175]

On our 1986 #89 , the oil pressure sensors are located on the bulkhead of the driver's side engine compartment.  There is a sensor / sending unit for the dash pressure gauge , and a sensor for the warning light . I added the gauge at the top of the "manifold " , which h is a garden variety NPT fitting. Not sure if the coach you are dealing with is in the classic range , Michael will know .
I will try to get information from the power steering pump . Most , or all the parts are from the heavy truck /bus world .
Chris