The connector repin is tricky at first, but you will quickly get the hang of it after the first one.

You can see on the back off the connector is a plastic strip that locks all the terminals. you need to hook the clips for this on the sides so it can be pushing up off the wires. It will stay attached to the connector, like a hinge.

Once that's out the terminals will still be in place. Looking down into the connector there are very small plastic tabs. You need to push these tabs up from the backside to unhook them. To do so slide an awl or dental pick on top of the wire until it presses the plastic. You will fumble with it at first but keep constant tension on the terminal you are removing so you know the second it's free.

From there you can move them all around, one at a time. The simply click back in place. The locking plastic tab on the back just clips back when you're done.

My Mustang cluster required numerous additional pins, so I picked up some connectors from the junkyard to solder in for the extra terminals. This shouldn't be an issue for your 03, just use one o f the extra pins from the oil or volt gauge for the tach signal (cut it off and solder on)
As far as extending wires, *SOME* will stretch over enough provided you unwrap some of the harness. Some won't make it though and need to be lengthened.



Darkness is not an excuse. I repined my connectors in the dark for the Mustang cluster swap Route an extension cord to the car and use a worklight so you don't drain the battery, preferably fluorescent so it stays cool.