Will a r33 gauge cluster fit in an s13?
 

I have an rb25 swapped s13 and want my gauges (mph or kph and tach) to read accurately. Is there any other alternative to another gauge, or those expensive analog replacements?

http://www.gruppe-s.com/Defi/defi_dsscflash.htm

Pure Sex

Pinion?
 

It looks like the cheapest way to get the mph correct is to buy a 300zx speed sensor from autozone ($75) and a pinion from courtesy ($15-$25). I don't know which pinion to get, however. They range from 17t to 21t (t is for the amount of teeth on the pinion). Which one do I need for the rb25 tranny?

As for the tach, Carl H. is supposed to help me for $45 plus shipping.