I hope this question isn't too silly...
I've got a 33 GTS-T which has the little gauge on the tacho from -7 to +7 x100mmHg. I believe this is mm of Mercury, or Torr's, where 1 Torr = 19e-3 psi. So 100 Torrs = 1.9 psi. So each 100mmHg on my gauge will be 1.9psi, meaning the gauge of -7 to +7 is actually -13.3 psi to +13.3 psi. Is this right?
Secondly,... the needle on my gauge sits at -7 at idle, and goes to 0 at max boost. Is this normal on a 33?
Thanks for any enlightening information you can share with me!