rx7legend

hi, i have a 1990 TII and since the day i bought it, the car eats gas like hell, and when i check a time ago i saw that the previous owner did a custom downpipe but he eliminated the o2 sensor,( dumb jackass) well i put my rb exhaust and i have my o2 sensor on the downpipe but i don't know where the hell it plugs too, i've searched everywhere but i dont find anything. i really need this cause ive been running without these for a long time, and i also have tu tune my safc.

thanks

ilike2eatricers

it comes off the same harness from the BAC behind the WP