Adding a temp guage to a 3
#3
Not if it's a Gen2 Mazda3. Even then all the Gen1 cars get is a glorified "idiot gauge" which is slaved to the OBD-II computer and will only register "too hot" when it's "too late".
#5
As I understand it, the 2010 has a 2-State light that only lights up when the engine gets too hot; the 2011 and later has a 3-State light, one color for cold, off for normal and another color for hot.
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