Does anybody have any experience of fitting a Tachograph to a 1996 P38 DSE or 2002 L322 4.4 (BMW) LPG. I am thinking of changing from my P38 to a petrol L322 LPG as its doing huge mileage towing for my used spares business and its border line to me if I need a tachograph. I cant seem to get any definitive word on the tacho situation. I see various used bits on eBay but not sure if I could fit myself before calibration etc done professionally.