im gonna install autometer EGT, TRANS TEMP, AIR FUEL RATIO, made a custom pillar pod.....im gonna be installing the nismo suspension & exhaust. the question is i dont wanna drill any holes, can these gauges be tapped into the factory sensors? are there factory sensors for these readings? If so where can i find them?

The last question is i am installing an intake and suspension, and exhaust,UR pulleys......i am having the factory headers ported and polished as not to void the warranty, Apexi REV/SPEED, APEXI SAFC. i know that the OBD II is a complicated computer, should i get a chip or ECU flash? how do i go about getting the computer set for these mods?

anyone who has extensive knowledge about the Z can be very helpful in these questions!!!!