I have recently installed and engine interface to run all the engine stats digitaly through the HDS unit, now my question is do I need any of the wiring from the old analouge guages at all, and can I cut them all off and wrap them in electrical tape? I have found that one of the wires from the ignition alarm was connected to the old Taco plug (as seen in the photo below top left wire on plug). The purple in negative and is an easy cut and re-join but what wire do I need to connect the other wire (light greyish) to to get the engine alarm function to work as normal????

Also these are the old wires from all the old anolouge guages, can these all be trimmed off neat and wrapped in tape?

Any help will be greatly appreciated.
Cheers in advance.

