Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 250001-874 found under Indicator Electrical Tachometer by Sullair Corp. The National Stock Number assigned to this part is 6620011696680, and the Federal Supply Class is 6620 Engine Instruments. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 250001-874.