Getting the gauge cluster out is a process. Getting a problem after you put them back, is a PITA. I don't fit too well on the floor with the pedals and all so I found a way to get to the dash while still on the seat. How to reach and see what you are doing is just part of the problem. You have to drain the antifreeze below the sender. You have to mark the lights. You will have to deal with the rubber grommet, and you still have not put a wrench on the gauge yet. So be patient, take a deep breath and when the water is out of the radiator, and you have decided what to do with that darn grommet, then get ready to take the dash apart. I start with the battery cables(safety) and then the glove box. Just the liner, funky cardboard part. My truck, 52 1/2 ton with a recirculating type heater has enough room to push the liner towards the firewall and tip it out from under the dash. Pull the ashtray out and reach through the glove box to the fasteners on the trim. A nut driver type of screw driver will fit. You will get enough room to work and see from here. There are good tips on the gauges in the tech tips. And you can fix most things on the bench. The odometer bits can be a challenge, but they can be sorted. If the grommet in the firewall is soft, you can peel it out and shove it through the firewall. But to get the temp sender out I just split it. If it is hard, well it needs to be replaced anyway. You won't be able to save it.
