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Keep in mind that the speedometer maximum was determined by the tires equipped on the vehicle from the factory, not the engine. You could get an "LT1 cluster" with the lower numeric speedometer.
The resistor/tach thing sounds right as you have to make minor adjustments to aftermarket tachs for the same deal. If you get stuck you may even be able to use an aftermarket tach adaptor to correct the reading of your stock gauge.
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