5.9 Magnum into a 73Duster

My friends was from a 96-97, I think he is only runnin one O2. He has headers and dual exhaust so he is only reading one side. it just shows up as a fault code when he checked the OBD2.
Mine only reads one side too.
Maybe your aware already, check the fuel press and make sure it is well regulated.
I believe mine only has a 3psi or so operating range.
He put an 833 4spd behind his,and had to machine up and modify a flywheel, so he also has an auto trans fault code that shows up.
If you have the skills or a buddy willing to tackle the floor mods, I'd highly recommend adding the Overdrive. Mine has a 1993 a518 with lockup, and 3.91 gears. With 25" tall tires, its turns 2350rpm at 65mph and 2725 at 75.