EMS6 control is on the box itself. It dials degrees of retard per thousand rpm when in boost. Boost is determined by hooking it up to one of the original injector boost switches fitted originally by Janspeed - low pressure one if you want retard straight away, higher pressure one if you want a delay. Crude but effective - available to order from MJP.
Almost any aftermarket fuel pressure regulator is better than the OEM unit which was never designed with turbo boost in mind. Range from FSE Power Boost Valve with 1.7:1 enrichment rate and faster response (about £70 - £75) up to Corky Bell specials which claim 15-20 bhp gain at £200 ish. The latter is a bit of a lump to find space for, but highly respected...I've also used the newer AEM unit on some NA cars; also expensive, but pretty anodised colours and a port for a permanent gauge to be fitted (not included in the hefty price tag).