Thanks Ian for the diagram, Does the grounded sw`s need a common earth or perhaps use the analogue earth back to the ecu? Excuse my ignorance but there`s some extra bits and bobs on this setup that i did`t know about i.e Cal2 is this a different engine map? Gearcut so i`ll need some kind of micro sw fitted but where? and this will enable what exactly, ISS(intercooler spray?) does this spray on to the outside or is it water injection? Is there any need for two cooling fan outputs? and finally auxillary tps output? Shift lights handy as i was going to purchase a Stack one. Thanks again for the help