The tach wire is the best, because it gives the brain module a definite signal via the wire, to let it know its running. I dont have the Stellar brand, but most remote starts will shut off the ignition sircuit if it doesnt receive the tach signal, because it doesnt know if its running or not. The negative side of the coil is an easy spot to get to, and it works well. The RPM learning uses the same wire (or it should).
-There are 10 kinds of people. Those who understand binary, and those who do not.
-If we ever forget that we are One Nation Under God, then we will be a nation gone under...Ronald Reagan