I got 650s precision injectors used. They r just cut off so I can't plug em in or anything... how do I install?

 

did the injectors come with a clip and two wires sticking out of that clip? if so you cut and splice or you can find an adapter so no cutting or splicing is required. holla at dezod, decendant, p-tuning, ect...they may have pnp adapters

 

Yes they have a clip with the 2 wires coming off. Now my prob with splicing is the 2 wires off the injector r black. The tc wires r black and red. Do all 4 stock injectors share a common ground? How can I figure out what wire to what. Or does it not matter

 

look at the stock injectors and note what wire is in which side...

 

you still can get pnp clips instead of cutting