connector holging bracket on the firewall

[Konstantine Bogach]

How to remove connectors which are fixed in the bracket?  Example:  RPM 
sensor and reference sensor in 200tq,  or ignition wires coming out of 
coils in UrS4.  It appears that  each connector is locked with a tab - 
part of the braket.  Logically I would the tab should be bent out of the 
way but it is heavy gauge metal and I was skeptical about using pliers.
I  had to cut the tab once when I needed to get a connector out  and 
after that I have to use tie wrap to fix the connector in the bracket. 
I have a feeling that the is a smarter way to do it.  Unfortunatly,  I 
don't see this way.   Any ideas?
Thanks.
Konstantin.