5v should be acquired from a known good source like the TPS. If you lose that signal at least you will get a tps code and have a little safeguard. The wiring that is used for the MAP signal to the alky controller needs to be dedicated and should never be tapped into or spliced into. Any breakage in connection or malfunctioning signal at that circuit and your engine will be damaged if you run it hard. Properly crimped weatherpack connectors with breakouts are the only acceptable connection on an important signal wire like this!