Hey guys, long time since I've posted......as a brief history, I ham a HUGE GN fan, I had an 86 GN acquired from orig owner/collector after selling all his others. I sold it back to him in my divorce 13 years ago. He recently passed away and low and ne hold he left it to me, so I have it again. The car hadn't moved since I parked it in his basement 13 years ago,. So I now have it running, and am about to take it to a local shop for a once over. I noticed an issue that wasn't one when I parked it. The digi dash speedo is WAY off. The KMH is far closer to real speed than MPH, MPH is 25-30 off. What could have happened while it sat all those years?