I need little help from someone who already installed this kind or similar bypass module for a remote starter. See picture below (W2W wiring)
Except for the +12V and ground (-), does all the other wirings are necessary?
Anyone familiar with this?
Because I don't understand why I would get a TACH signal output from my remote starer?!

-Tried to get support from xpresskit.com but they did not help at all...
THANKS