Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D-1970-1V1 found under Indicator Electrical Tachometer by Mmc International Corp. The National Stock Number assigned to this part is 6680012716800, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like D-1970-1V1.