FOR SALE - Vintage 1974-78 Rupp Nitro / Magnum / Rally Snowmobile NOS Tach / Speedo. Note: This is for the Rupp 1974 Nitro II / 1975 Rupp Nitro Fan Cooled / 1975 Nitro Free Air / 1976-77 Sport / 1976 Rally / 1976 Magnum / 1976-77 Nitro Model Snowmobiles. $100.00 Each