I ordeted a different HD speedo to replace stock 2016 speedo. on the 2016 Heritage. Its the digital with changeable light. Dealer was a little lost. Thete is a,power pigtail offered for fuel sensor. Am I also going to need this pigtial for my fuel gauge to work? Dealer did not really know. Parts guy was only there 2 weeks and is new at the job. So do I need this,pigtail and sensor or can I do without it.