To do the AFR gauge right ithink you will need to get a o2 threaded bung welded on your downpipe for the new sensor. Because useing the stock o2 wires will only give you a narrowband reading. As for the oil pressure ive always really wondered and wanted a oil filter spacer with a high pressure side and a return side. Bolt are easy and inexpensive but im not sure because i dont have any of those gauges set up haha.