I want to use a mechanical oil gauge simultaneously with the built in dash warning light. The internet has nothing on a sender split configuration or "T". However this image shows it was stock for the Rallye dash. I have the gray wire for the sender to warning light, but want to make a T out of fittings so that I can send oil to my gauge and also have a sending switch to trigger the in dash warning llight. Any reason this wont work? Why is it so rare?