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Hi Deevo haven't used the Saas gauges but have these and find them great check this link great to deal with too
http://prosportgauges.com/

Probably not twisted steering column, more likely a torn rubber like westy said or maybe a bent draglink.

Check the rubber flex join in the steering rod.. it may have tawn

http://www.nissanpatrol.com.au/forums/images/imported/2015/12/85.jpg


Anywho..
If the diff is still in the car you will see on the Vin number what ratio it is.
Given that the diffs are...

You have a H233 in your GUIV TD42Ti

You need to know what rear diff you have first. H260 or the smaller H233b. Just count the number of bolts holding the centre in to tell. H260 has 12 and the H233 has 11.
Fronts are the same. Dont...