I just made up a new harness. I found some twisted pair shielded cable at radio shack. I cut the white knock wire out of the stock "harness" and I soldered in on of the wires from the shielded wire. I then used shrink tubing to join the two wires back together at the knocklite end of things. I guess I'll solder a new wire to the shield braid and attach it somewhere to the body ground. I haven't installed the knocklite yet. I only had time to put in the new wire. I still have to figure out which wires to connect for a 05 USDM FXT ECU.
EDIT: I don't think this thread should be in the UTEC section. The knocklite can be used with ANY EM or no EM at all.