2002 Ford Explorer, Remote Start

Does anyone know if I need to use a relay with the XK04 when using it with an 2002 Explorer? Diagrams say there is an "optional" relay for giving the tx wire a ground?

So I am about to connect my viper remote start and before I start cutting I thought that someone might be able to help.

Essentially, I am looking for whether I am "t"ing into a line, or putting the remote start in beween that circuit. Here' the list:

• Parking Light Wire : T or RS in between?
• Domelight Superivion Relay : T  or RS in between? Anyone know where that relay in in 02 explorer btw?
• Horn Honk : T or RS in between? I'm assuming in between the column and the horn the RS goes in between?
• Neutral Safety Switch  : T or RS in between?

Other dumb questions:

• What is a "second unlock" wire and where does this thing get connected? T or RS in between?
• The Satteline Relay unit for high voltage has about Qty 3 12v input wires. Why? Do I need more than one?