that "gadget" is there to join the pipes rather than using one long pipe

you can use the mechanical bits from either car but you must use the electrical bits from the 2wd or the 4wd cars for each application

the sensors only differ in the amount of shielding they run to stop the signals getting interfered with from other sources and, from memory they were something silly like 104 108 and 112, but what the numbers mean i have no idea

the bigger numbers were from the granadas as they ran more electrical stuff so they required more shielding on the cables

the 4wd ones also had additional relays i the fuse box and the abs trigger time was both later and less effective so as to stop the transfer box killing itself under repeated heavy stopping