You are going to need the Kenwood cable that adds two RCA jacks to your head unit. Hopefully the Z919 supports it. The cable is about 2 feet long and has the two RCA plugs on one end and a DIN plug on the other. The Z919 should have the matching socket.

Who put the Z919 in? You? When you had the dash apart was there room for a second DIN box? Often Toyota will fill it with a storage pocket.

If the Z919 was put in with an adapter cable it will make life easier. This is a short wire harness that has the plug for the Z919 on one end and the mate to the Toyota factory harness on the other (the same connector that was on the back of the factory radio). The nice thing is that you can usually take the adapter cable completely out of the car and wire the empeg harness and cage into it on the workbench.

I work in Redwood City but only every other week and fly home to Utah on Fridays. So I can't hold your hand. But yours should be one of the easier installations if what I describe above is true.

Do you have a digital camera? Are you comfortable with a soldering iron or gun?