You should have taken them out of the Carlsson. Saab gauges very difficult to find (I've got a spare set ) but any satandard 52mm gauge will do, VDO did the ones for Saab. The senders are expensive and still avialable from Saab (well they were 3 years ago when I got my senders) at the time VW senders were available (made by VDO) and a direct fit. Is the pressure switch M10*1.5 (I'm guessing), temp sender no idea.