I have a 2010 grabber blue mustang gt ....I bought a 2012 totaled Boss 302 I want to do a motor swap and computer and gauge swap do I need to change the complete wiring harness to make this motor work or can I change the computer... I noticed on my gauges on my gt I have oil pressure ...battery ..fuel...and temp ... and the boss gauges only have fuel... and temp please if anyone can help it would be much appreciated