Are there any Chrysler electrical guys that understand why they did the things that they did back in the day? I'm talking about the engine harness on a 71 B&E body and how the oil pressure indicating circuit was wired. On the oil pressure sending unit, if you have a Ralley gauge set up there is what is called a resistance wire that goes from the sending unit to the regular wiring harness. The book shows this wire for both the Hemi and a 440 and my 383 RR had this wire new. When set on the 20 scale on a ohm meter it shows a little over 30 ohms. My question is, why was this wire there and everybody I talk to has never heard of it. Is it really required?