well dude before you buy any car do the following:
-take it for a test drive
-take radiator cap off while engine is running and look for any bubbles
-listen to the engine carefully
-sniff resevoir (if it smells like petrol then stay away from it)
also feel how good the boost feels and feel how TIGHT the car feels in terms of suspension and steering....
if the car makes bubbles in the radiator and you can smell petrol in the resevoir then this is a good indication that the headgasket is on its way out, stay clear then , but also if it makes bubbles and the resevoir smells clea then it could be the water pump, however if the car feels loose and the engine makes weird noises just steer clear of it...
also check how many k's its got on the clock and then check things the wear on the accelrator pedal and the wear on the steering wheel and seats. for instance a car that has 40 000 k's and has badly worn pedals, steering wheel etc. just tells me that the k's have been wound back, so watch out for this as well...
anyway do the following and it will tell you if the car has had a hard life or an easy life, if it has had a hard life then you should stay clear of it....
however remember the RB motors take quite a beating man, they are a VERY STRONG motor, so my advice to you is to get a skyline :D:D, and with the instrument cluster take it to a car sparky they should fix it no worries, but only if the mechanics of the car checks out ok...
-bryan