Hi i have done this mod to my Frontera sport (isuzu MU) and it was quite easy
1 remove the radiator and fix the fan and motor to it so it sucks air through the rad and into the engine bay - use mounting kit provided and fix securely
2 remove the viscious fan unit and any other parts not required ( I managed to remove the whole spindle and bearing and fitted a shortened drive belt
3 install the rad and fan assembly
4 check the clearences remember the engien does move but the fan doesn't check it wont contact
5 install the electrics with a cut off switch on the dash
6 i used a couple of diodes to ensure no back feed problems and wired the fans via a rad mounted temp switch from a trooper it fits into the blanked off hole in the top of the rad
7 i also fitted an adjustable thermostatic switch which has a sensor inside the top hose
8 wiring is permanently live with a 30 amp fuse for each source of power
9 the trooper sensor is the back up on at 100-105 - off at 90-95 and the adjustable is on at 98 off at 90
use good water proof tape and solder and heat shrink all joints
10 alll wiring is through 40 amp relays directly fused from the battery
you can see the rad mounted switch on the top of the rad and the adjustable top right of the frame
both fans run together in parallel and it cools like a freezer on speed
cheers
Steve