Trying to find out how to make my factory tach work with my 302. Anyone know which wire to use or if it will even work?

im running really rich ive blown up 2 cats now from running rich and im only getting about 11mpg on the freeway in 4th i used to get about 25 to 28 on the freeway with the set up i have any ideas? changed O2 tried 3 different mafs didnt make a difference. im so f'ing frustrated

Hey guys i just need that one exhaust pipe. It connects right after the cat and is the pipe before it bolts up to the muffler part. does anyone have this with no holes or rust let me know thanks.

Up for sale is a CXracing 3 row aluminum Rad, Two 12" Electric fans wired with stock harness plugs, a thermo sensor in the bottom of the rad and the hoses. This is literally a plug and play setup!   $200 plus shipping (Shipping to the east coast is about $40)     EDIT: I ran this setup for a year with a 180* thermostat the temp never went over half on the stock gauge. There is one strap that I used to mount the rad I'll include, the other fan was not installed in the photo but will be included