crankshaft and TPS addtional ground wires

So ive been reading threads on adding extra grounds (splice in and run it to battery or firewall) for the MAP and TPS.

im not exactly sure which damn wires are the grounds. when i test the sensors the chiltons says A or B or D or C, but im not sure which is a ground. ive been searching and reading lots of threads but not finding what i need. sensors seem ok, but i might have a CPS that may be getting weak or a TPS with a dead spot, or something else.

i have lots and lots of clean 2 guage grounds, new sensors, and cleaned connections .

PM me with your email address and I'll send you an instruction sheet on testing the sensor ground circuit and adjusting the TPS. If needed, I can send you a sheet on repairing the sensor grounds id you determine that they're bad after testing..