[camaroracer1992]

i need to install an oil temp gauge and an air fuel ratio gauge on my 04 silverado 3500 for my a-pillar gauge pod. i have 2 questions:

1. for my a/f gauge the 02 sensor has 4 wires; 2 black, a white and a blue. what one do i tap into for the correct reading?

2. for my oil temp gauge i would like to put the sender in an oil pressure fitting so that i do not need to drill into the oil pan or tap into any lines (i want to do the least amount of hacking). where are they located on the new big blocks? theres a fitting above the oil filter like the small blocks but its a weird ass size square plug that i cannot get out. any ideas?

thanks

joe