The speedometer 2-speed adaptor is calibrated to match the same ratio as your Hi and Low gears. Your 1959 will have 9.04 Low and 6.50 Hi ratio gears, so in Hi range your speedometer cable will spins 29% slower than in Low range.
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD
