OK, was wondering.
You have pictures of the needles before removal, with the truck on? That would be the best way to put them back on, but you have to match up the variables, like whether the truck was warmed up or cold, since that would affect temp gauge, tachometer, and usually oil pressure too. Anyway it's easy enough to leave the clear lens housing off the cluster and plug it back in so you can turn the truck on and install the needles.
When I had to re-set needles on a 454SS cluster someone had done a gauge face on, the needles were completely wrong so I had to set everything. Used an IR temp gun to check engine temp, filled gas tank up and set gauge to full (then checked again when it said half by seeing how much it took to re-fill), speedometer using GPS, tach using a diagnostic tach hooked up to the coil tach lead, oil pressure with a mechanical test gauge, and voltmeter using my multimeter measuring at the battery. A bit of work but in the end gauges more accurate than the factory ever bothered to set them.
Richard
