Harness cover, need help asap
 

I'm not really sure if this should be posted here, if not sorry about that. I'm trying to tap the RPM wire on the ECU harness, I'm almost positive I have a the particulars except one thing. I can't seem to get the cover off the wire harness, this is the cover that conceals the wires going into the plug. It makes it very difficult to see were each wire is located in the plug. I'm outside now trying this so if anyone can help asap I'd really appreciate.

Should be ashamed of myself for asking that. Took a closer look.