RE: temp. gun
I use a raytek mt4.
Just make sure if you don't use the laser to aim for the plug. Place the temp gun right on the head and move it around till you find the hottest temp. If I hold mine 2-3 inches off the head and use the laser the temp will read 220 but if I put the temp gun right on the head it reads 260.
I see people use the laser and be like "wow my engine is only running 180" when its really probably 240 or more. That's just what I've found out on mine.