F150 speedometer starts at 80 and will not go back to zero

Hi - Dave here, contributing to RepairPal and providing expert advice since 2010. The speedometer head of the vehicle sounds like it is compromised. The speed sensor only moves the needle to where it thinks it should be from zero. If starting at eighty, a fault in the head itself is likely. https://repairpal.com/auto-repair-near-me Click the link to find some shops near you who can help out! or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.