Originally Posted by 3414

With that engine and transmission you might not have a place to connect the speedometer cable, the 2000 trucks used a pickup on the rear axle to drive the speedometer.

Someone might make an adaptor or input device to get you a mechanical connection if you want to use the old speedometer.

On the old gauges - they will work with the Lightning engine if you put compatible (old style) sending units in the engine.

It might be less work to adapt the gauges and speedometer from the Lightning cluster to the old cluster.