I think that by "throttle cable" they are talking about the "kick down" cable that runs from the throttle spool on the engine to the auto transmission. If you don't disconnect it from the throttle spool it will be damaged when you slide the transmission back. Pay careful attention to it as it is a PITA to change and can do internal damage to the transmission if pulled too hard.

"...remove the bracket and throttle cable from the 'dashboard'..."

If I were doing this job, I'd disconnect the throttle cable from the spool assembly on the intake manifold. In short, you don't want to tear the cable apart when you allow the engine to pivot downward.

"...remove the converter attaching bolts..."

When you drop the bottom bellhousing support bracket, it exposes the bottom of the flexplate (ring gear) and the torque converter. (This bracket bolts to the bottom edge of the bellhousing and also into the block up next to the pan.) You should be able to remove one (of the four) bolts that secures the TC to the flexplate. Rotate the ring gear 90 degrees and remove the second bolt, rotate for the third, rotate for the fourth.

When you finally pull the tranny back away from the engine, be sure to keep the TC tucked up inside the bellhousing with the tranny. No need to pull it out of the tranny.

Before you dismount the flexplate from the crankshaft, BE SURE to first scribe alignment marks so the flexplate will be reistalled in alignment with the engine.

"...how do I remove the speedometer from the case?"

The speedo isn't connected to your tranny -- it connects (electrically) to the differential.

Be more specific about what you want to do with the speedo. Are you asking how to remove the instrument cluster from the dash?
--
Don Foster (near Cape Cod, MA)