fast efi problem

I have heard bad grounds are a huge gremlin in any efi retrofit system. Does your O2 have a dedicated ground lead? Especially on a ceramic coated header. Seems it should go into limp home mode if 02 sensor craps out? I have a temp sender bolted into a cast housing thats bolted to my head, it has a gasket between the housing and head and i have to run a ground wire from sender body to block, the bolts dont even ground the housing enough!