need to find tach wire for remote start

[rayford]

I have two problems with installing the commando remote start/keyless entry system : First I need to find a place to hook the tach wire from the remote unit, and the wiring diagram I got with it says it is a yellow wire at the ecu or dash tach, well I can't even see the tach from under the dash and I don't want to mess with the wires on the ecu, besides there looks to be at least 4 yellow wires going into it,, the other option with this unit is to wrap the tach wire around a spark plug wire, and since they aren't like normal sparkplug wires , that doesn't work,, does anyone have any easy way to do this??
Second problem is the door locks.. they said that it is a negative pulse system and I didn't need the relay, well I connected the wires in the drivers kick panel and nothing happens. I kind of have my doubts as to whether the wiring diagram they sent is exactly correct anywary , because the wire they said to use for the brake light was wrong, I finely found the right one, and that seems to work ok....... the reason I need the tach wire hooked up is it starts but only runs a few seconds and dies then restarts and dies and once in a while it will stay running. so thanks in advance for any help you might give on these two issues..
Vernon