my question is I have a cross fire injection car and I put a tpi engine/harness...what gives the harness power???...All my sencers are connected the ecm is conected to the harness but no power where does it connect to the harness???:hail:

 

Part of your conversion should have been an ECM from a TPI car. The ECM gets power from two circuits. It supplies power to all the sensors from those sources. ECM loads, like relays and solenoids, generally get power from the gauge circuit, and the ECM only switches the ground path to complete the circuits to operate the devices.