Repaired items are always handy to keep in the glove box incase of emergency!

From an educated guess, the fuel pump should probably draw around 15 amp. IIRC a Group A Cossie 044 pump (>220l ph at 5 bar) draws 16 amp a full chat at 5 bar pressure. RSTs run 6 bar base all the time so estimate at around that area. A 40 amp relay should be plenty good enough.

There is 2 rev limits on a Series 2 RST and there is 2 rev limits on the S1 RST.

The S2 has a limiter in the fuel ECU at 6250 rpm as well as in the ignition ECU (unless the chip removes this limit).

The S1 has a limiter in the fuel pump relay at 6500rpm (adjustable) as well as in the ignition ECU (unless the chip removes the limit).