Yes Pete, the old regulator wires are tied like that. They get tied the same way for either the SI or CS.
No you don't need a diode or a resistor.
I can't see your new plug with its colors but the brown/blue wires go to SI terminal #1. SI terminal #2 just needs to tie to the large B+ stud on the alternator's rear side. Works OK there unless you are making some large electrical mods to the car.
This might help.
http://www.chevelles.com/forums/showthread.php?t=93941
No you don't need a diode or a resistor.
I can't see your new plug with its colors but the brown/blue wires go to SI terminal #1. SI terminal #2 just needs to tie to the large B+ stud on the alternator's rear side. Works OK there unless you are making some large electrical mods to the car.
This might help.
http://www.chevelles.com/forums/showthread.php?t=93941