Running a wire from engine to ECU - How?

To do a DPFI to MPFI swap, I need to run some extra wires from the ECU to the engine bay. How can I do that (where's the opening?)

Thanks

follow the harness to the firewall...then hook the wire to a coat hanger or something...and push it on through to the otherside.... either that..or look for an extra 'plug' in the firewall in that vicinity... should be a black rubber circle...pop that out and run the wires through there..

yeha like marked said, follow the wires on the passenger side shock tower and find where it goes through the firewall.

when i did my mpfi swap, i got a plastic tube and shoved it through and just ran my wires through the tube and after pulled the tube out. and bam your left with the wires going through the firewall. got it ?

Yeah, thanks.

Would it be easier or better to use this other unused hole in the firewall?

If you look near the windshield wiper motor there is a black grommet, you can use that hole. If you don't have A/C you can use the A/C grommet. Or shove a tube where the other wires go into the fire wall, and just do it the same place those wires go.