Here the good thing and this it will make it easy, The reason for that jumping tach meter tells you that there is spark and no fuel. Without fuel the spark KV voltage is 30kv. and it report to the tach. So you got spark and no fuel. If you had fuel the tach will show during cranking little tiny,tiny movement that you wont even see. So do this turn the key in the run position cycle it do you hear a humming noise from the rear you should that is the pump, they are sort of loud, If you dont you'll need a fuel pump. Even if you heard the fuel pump the fuel delivery may be low of pressure to start the engine. by the way try this have some one crank it and you hit the bottom of the tank may be you can shock it back.
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