...heck, I'll try to help:
The oil pressure sender unit's sending apparatus (mech or electrical) should thread in to the bottom portion of the engine on the driver's side. Looking at the engine, with the fan on your left, and the cab on your right, the location of connection is about 25 cm from the rear of the engine, and 10 cm from the top of the oil pan. There is a "t" shaped fitting located there, usually. It should connect.
The temperature sending unit connects to the temperature sender threaded into the cylinder head. This is at the rear of the cylinder head, when viewed from the front at the fan. It may be shiny brass.
The speedometer cable connects to the transmission.
Brad
