Yep, get the Walboro and pay a bit more, for an SX regulator. www.asperformance.com will sort you out with them.
Oil pressure sender unit, fit's directly into where the OE unit is....underneath and slightly to the left, of the alternator. Never fitted it anywhere else but here. Defo the easiest way.
Oil temp is awkward. It's ontop of the block again and infront of and to the right slightly of the turbo. There's a blanking plug with an Allen key hole ontop of it. You need to either buy a modified blanking plug, of modify it yourself, by drilling and tapping it, to suit the oil temp sender.