with the temp reading:
it is pretty normal for the reading to go up on the zetecs, espically in a traffic jam when its hot, etc. mine goes up to M or L, most other times mine will be in the middle, and my zetec runs perfectly. i wouldnt be too worried if it goes to the "M" or the "L", but if it starts going into the red then i'd say you might need to check that out. if you are worried about overheating, i remember someone saying that turning on the A/C will also cool the engine? correct me if im wrong though
