hah speak of the devil i did the same exact thing a couple weeks ago. i had the 02 sport with a black and red interior, but the red guage faces i didnt like as it didnt show the redline and i couldnt change the color. i had a 98 le so i took the faces from taht with the white face and left the red needles. looked alot better, but i found when i turned my key to accessorry my tach went up to 1000 and my speedo went up to 10mph. with the car off

. i drove it once and was kinda amused to see my car reading 100mph when i wasnt close. i have had the car off the road for a little while so i never got around to fixing it, but if you decide to do it just trial and error.
temperature - set to ever so slightly under half when car is fully warmed up.
gas - fill the tank and set it fully to the top.(dont do an empty tank, thats no good)
speedo/tach - just keep going till they rest right on 0.
it will be a pain cause the needles are like electronically spring wound so even if you put it at the very bottom of the pin they will still rise up.
also while i was in there i swapped out the green plastic for the blinkers and replaced them with clear plexi glass painted blue for some blue blinkers