inputs.text: erratic display ok functions properly - bought mostly temperature gauge x308 jaguar xjr 2000 since dashboard gauge not really gauge pointer likely alert overheating late save cooked engine works randomly frequently need disconnect reconnect correct reading sometimes no reading car started sometimes lights show random patterns unrelated anything obvious would much prefer normal display rather mirror image leave mounted somewhere front dashboard instead hud top dashboard bright sunshine windscreen reflection unreadable without tinted plastic sheet attached window dont know like sheet attached havent tried wouldnt expect much improvement leave half stuck cassette unit learnt read mirror image digits instruction manual almost useless not difficult figure basic operation anyway plug press buttons randomly change display get want brightness switch difficult move display goes bright dim randomly anyway