The black one as stated is the coolant sensor, and the white one as also stated looks like a speed sensor plug, HOWEVER, MFI RST's dont use a speed sensor, do you have a fuel computer on board? I cant see it being this however as the fuel computer is not part of the main loom.

Tony Turbo: S2's have never come with electronic dipsticks shame they cut a lot of nice features out from the Series 1