Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 311-3858 found under Kit Sensor Engine Spd by Unac. The National Stock Number assigned to this part is 2815015666487, and the Federal Supply Class is 2815 Diesel Engines And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 311-3858.