All depends how far you wanna push it Mine will be having new rings/honed, Athena gasket (1.2mm to keep standard compression ratio) and timing belt, oil pump so will be pretty fresh
Yea cant argue with that mate Gonna be running 1.4 bar on a stock motor with my TD04 kit, but with 330's hopefully hit the 250 mark like you but I have a stock inlet manifold.
Its pretty simple to install from what I am aware. Screw the sensor into the exhaust run the wires to the cabin and the gauge, plug the gauge into your ECU (I have EMU so it will plug straight in there) and just a few wires to power the gauge.
Same kit as il be getting Pretty easy to fit I would imagine mate, gonna do mine myself. Just need to get my exhaust made and the bung welded in there first