hey people im hoping someone can help.im looking to buy this mocal gauge for my orion.
http://www.ebay.co.uk/itm/2708781720...84.m1423.l2649

it comes with a 3/8 bsp fitting on it.im wondering what this converts to in npt as im not sure whether to fit it to a sump plug adaptor or t piece the oil pressure switch.any help would be greatfully appreciated as its confusing the hell out of me lol