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The 79-80 20R trucks use two round plugs with round terminal pins, whereas the 81 and newer uses 2 or 3 flat plugs with flat terminals. Also, begining in 81, Toyota used two differance wiring harnesses--std and SR5. ! have rewired a std truck to accept the SR5 tach dash I had to idenifly each wire, remove it from the plug with a pin tool, and proply install in the right slot for the SR5 dash Marlin
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