Thought I would give this a try as a possible cure for a 'dead' temp gauge. In retrospect, I don't like the method suggested by the first poster. I have the 91 VN which has the (small) tacho. Problem is with pulling the needles off. You run a very real risk of bending the shaft. Even if you do manage to remove the needle without damage, the calibration will be severely effected if you put the needle back on in anything but the original position. Those needles are pre-loaded.
I would not recommend doing it that way. First, the steering wheel does not need to come off as the pod will come out without removing it. Then, with pod out, proceed:
Start as said with the 4 torx screws holding the curved panel in.
Remove the 3 nuts and washers holding the tacho from the REAR of the unit. Then the 4 nuts and washers from the Fuel/Temp gauge. Now the 4 torx screws from the Speedo. You will have to disconnect the connector from the Speedo. To do this, insert a small screwdriver into the small slot on top of the connector and apply pressure between the two connector halves as you gently pull the cable. Taking care to hold the gauges turn the unit over then slide out the 2 plastic dress strips from between the face panels. Now lift out the gauges
Once you have the gauges out, the regulator board is on the left behind where the tacho was. I think the earlier ones were a bad batch as mine seemed to not have the dry joint problem.