could upgrade o2 also
Q6. How do I wire up a 3 wire 02 to replace my 1 wire 02.
A6. Using a 3 wire for a 95 S10 4.3L TBI GM part number 19178959(I now use Walker AFS-74 because GM raised their price over $20), wire the dark colored wire usually purple to the computer and the other wires to a ground and 12v ignition on HOT. A relay and a 10 amp fuse would be nice too. Also on the wiring connector C is the one for the computer and A and B are for the 12v and ground. I now carry this O2 sensor in my ebay store to help you get the AC Delco version as cheaply as possible as I really have had too many issues with the Bosch units sold in most auto parts stores.
go delco!