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Some mis-info in here.
First off the TPI is vacuum referenced for fuel pressure. Seeing as the regulator is in the tank in a 4th gen you may have some fueling issues if you dont get a tune in there afterwards. I plumbed my 4th gen tank with a full return line. Yes the 4th gen is "returnless" but it really is not, the return line is very short and comes from the "T" block right before the fuel filter. So either get a tune (your fuel pressure is going to be VERY high) or run a return from the manifold.
I am not positive but I think the 98 tank is metal where the 99 and up are plastice with the evap on the tank. I have not seen a 98 tank to be sure so I cant say for certian. For the 99 and up tanks the fuel level sender is the wrong ohms, so the gauge would be wrong if you just hook it up. You can buy the correct sender resistor board and swap it in so the gauge reads correct.
The straps for the tank are the same. I used the 4th gen ones only because the guy gave them to me so I painted them nice and put some new foam on before I installed them. Also with the swap you need to cut the filler neck hose slightly, about an inch but you should measure and test fit first. I cut a little too much and the cap sits a little low in the sleeve thing.
If you do a search for my name on thirdgen I have posted in several threads about this swap. In the one thread it has the part number for the resistor board.
I also recommend the Racetronix pump if you want to keep the factory fuel can. I HAD to get the wiring for the pump as they would not sell the pump without the wiring at the time. I had better wiring than they were using for the "upgraded" grounds and such and I didnt want it but I had to get it. If you have stock wiring I would say maybe go for the pump and wiring harness.
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