One advantage, "fer xample" of the ORIGINAL Delco integral setups is that the no2 terminal was tied close to the battery, not through any amount of harness, connectors, or switches. This made for a very accurate "sense" setup.
(Even the old Ferd/ GM external regulators did this in a "sense," pun intended!!)
Mopar is the only "one" I know of that used the regulator supply--through all it's twists and turns--to act also as the sensing point. This means that it is VERY important that the ignition supply be close to the battery voltage.