You are basing all your statements on a single collection of cars - sorry thats not representative.
Lambda probes monumentally slow,I dont think so,you need to either read a bit or do some real research under the bonnet of vehicles - not just one or two.And bring yourself into the world of UEGO's.
Like alot of other car makers in the late 80's,early 90's LR used a mix and match of components.The Cux system had allsorts of bits and pieces in it,but I dont remember anything much of it being the same as the GM stuff I looked after that ran L jetronic - and K was mechanical anyway.
Sorry,but an exhaust gas analyzer just does not respond quickly enough to be of real use.Even the classic racing people are now using UEGO's to tune engines to make more power now than they ever did.I have a customer wanting to use them on an Alvis speed 25 six to be sure he is getting the best out of his SU's.
As an aside I see that elswhere on this bit of the forum you were asking about replacing corroded brake pipes.And then you ask about bleeding dual circuit brakes,with this level of knowledge I wonder why you are trying to champion the use of the wrong equipment to tune an engine fitted with an LPG system that can only do a weak job in fuelling an engine that needs all the help it can get.
