some questions for ya all

ok heres the low down. 95 chevy tbi being swapped to 2002 6.0 from a yukon denali. i have a nelson harness and ecm.
my questions are....
1 the nelson harness didnt come with a connection for the oil pressure sensor. does the ecm need to see oil pressure? can i swap the 6.0 sensor which is behind the intake by the cam sensor, with the 95 tbi sensor, that way my gauge works and if ive read correctly, my fuel pump will work with out further wiring?
2 the nelson harness came with fuel pump relay. would i be better off wiring the fuel pump to this relay vs keeping the factory wiring as it is now? if i need to use the relay how do i wire that up?
3 im using the 95 tranny and it is a pwm version. to get the tq convertor bolted up i know i have to slot the holes a bit in the 5.3 flex plate. now to bolt that to the motor it goes spacer (ring towards convertor) - flex plate (dished away from engine)- crank shaft?
thanks a lot guys. this site is one of the friendliest around. loads of good info and everyone is willing to help. im also open to tips and suggestions also if you guys got some.
once i get the pickup up and running ill give a full back round on the truck and the process of putting it in.

I can answer the oil pressure question. The new pcm doesnt need the signal. Use your tbi sending unit on the ls block. This will run the gauge. You will also use the original wiring to the oil pressure sending unit. The old sender wont thread into ls block so you will need a adapter from a vender for this. Ill work on getting you a p/n. Do you have the coolant sensor worked out?

heres a p/n for oil pressure adapter and coolant adapter. sku 1822277 water temp......... sku1822268 oil pressure. Thats from speedway motors.

will this adapters work with 99 5.7 vortec oil and water senders

ive actually got both the s&p adapters.the coolant sensor ive got pretty well figured out. its just that oil sensor situation im questioning. just trying to get things lined up to make dropping the motor in quick and seemless. thanks for those part numbers tho.i do appreciate it and im sure more then one person will find them useful