First off,
Next, if your on a limited budget, might I suggest ebay. I bought a whole new gray interior trim for my old 86 TA sometime last year (seller happens to be a member here too) for $75, thats just all the gray plastics and after some time and patience I cleaned all the pieces up and it really looked brand new. As far as the speedometer is concerned, again try ebay and look for one in the range of your mileage, that seems to be the cheapest route to go.
Theres also a classifieds section here, post up what you need and Im sure someone has what your looking for (cough SmokingSS
) Good luck