Keith,
I don't think a PT-51 is different from any other turbo as for as clocking goes. To clock your turbo just loosen the bolts on the back side housing,(about 6-8 bolts) usually on most turbos there are two brackets that are along the housing, once you loosen them all (dont take all the way out) the turbo will spin and you can get it to line up with your intercooler.
I hope I explained it right, much easier to show you in person but it is very easy to do.
Best of luck.