That's not surprising Marco - the SPA stuff i had in my Escort has to be the worse purchase I ever made! The stuff is crap!! It was forever going wrong and I have advised the new owner to get rid of them and replace with 2 or 3 x 52mm Stack gauges which not only wont break down but would go nicely with the stack dash!!

Or maybe it was just me that had unreliable SPA instruments!!