I have read about the fuel injectors for the TBI units being color coded and I have seen the charts identifying what code is related to what injector. My question is where are the colors located on the injector? I know I am color blind but on none of the 4 injectors I have access to do I see a color or colors anywhere. I see the numbers and have crossed those to be I have the correct replacements. So could someone please explain where the colors are located on the injectors.