Transfer case questions!!!

[iluvmy72]

OK....I am having a devil of a time finding the right transfer case for my 91 burb. I have installed a 1997 7.4 vortec in the sled and am ready to put in a 96 4l80e tranny. I have been looking to trade the current 96 np243-c for a np241-c with a 32 count input spline in which there seem to be plenty of but not with a passenger side drop. And of course I need the passenger side drop. Which leaves me with pretty much one vehicle and 2 model years. A 3/4 ton 1990 or 91 suburban with a TH-400. My question is I see quite a few NP208 and 205's available....I know I would need a adapter plate...but how would I adapt them to use electronic sending for the speedometer on the dash(is there a add-on option) and what else electrical/mechanical is missing from those units that the np241-c has? Sorry if I have confused anyone.....but I am getting frustrated.