I am trying to find a wire for power on my retrosound radio.  Is it the blue/red or the black/red. or neither.  If it is the blue/red, can I just plug into the blue/red for the shifter light power that isn't being used. (located under dash near the center by defrost pletum.  How and where did you steal your power.  This is on a 66 coupe with new underdash harness. TIA
				
			 
						 
					
				 
 
		