deuce lover is spot on here. Taking out the speedo makes this job much easier. Expect to drop a nut/washer or three so take care to make a place to catch those buggers. 1/4 inch ratchet with appropriate extensions will help alternating with box/combo wrench.
Be aware there are two light bulbs at 11 and 1 o'clock on the speedo as well as the easily removed speedo drive cable.
I'd advise you be gentle with the temp gauge because it's not really a wire but a liquid filled tube and is easily f-ed up.
While all this kit is out take time to clean the inside of the instrument glass with a q-tip reached in from behind, and carefully/gently clean the green plastic 'window' pieces that let light into the dials from the tops. I've heard of folks replacing that stuff with Sprite or Mtn. Dew bottle plastic.