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No. The cylinder heads and intake are different. If you have a 95 and are using a 2000 as a replacement, you will have to change the intake assembly along with the cylinder heads. The transmission from the 95 will have to be modified at the bell housing cover. The oil pan will be different but will still work from the 2000. You will need gaskets for the 95 year if you swap over the heads and intake. Once the heads and intake are swapped, the wiring will be the same
I doubt it's the pump. The only reason I have ever replaced pumps are on engine rebuilds or someone wanted a high pressure pump. Since you have good pressure, then no pressure until the RPM's are up. I would say the crank bearings are a bit worn. Going to zero pressure means something is not getting enough oil. Just a note... If there is a lot of sludge, some port could be clogged. But this also leads to a total engine rebuild, not just the crank and bearings.
Do you have under drive pulleys? If so, you can expect that to happen. It does not mean that something is wrong. You may have a high volume oil pump too. I have under drive pulleys on my Camaro and the oil pressure and voltage readings go up. I have never had a problem with that. I would worry when the oil pressure gauge does not move at all $$$$$$.
did you install the oil pressure switch origional to the tahoe? The tahoe uses a low oil pressure shutdown, instead of an inertia switch to shut off the fuel pump in the event of an accident. If the pressure circuit does not close within 3 seconds after the engine starts the fuel pump shuts off. This is in case the truck is on its side or upside down the pump will shut off.
Check to see if there's power at the fuel pump when cranking the engine. If no power, check the relay and oil pressure sender switch. If the engine looses oil pressure, it stops the fuel pump from running to protect the engine. The relay is located on the firewall above the master cylinder.
You need to determine if the engine has lost oil pressure (assuming the oil level is good) You need to place a mechanical gauge where the oil sending unit is that goes to your gauge. If this gauge reads low, you have an oil pump problem. Keep in mind that gauges and sending units can go bad. But the loosing power doesn't sound good. Start here to determine what is up.