The oil gauge will be electric, but it doesn't matter if he replaces the balance of the pod.

The very hardest way of doing this is from the bottom, so be careful of what you're watching on Youtube. Also, it's impossible to reconnect the HVAC tubing if you try to do it from the bottom. The correct way of doing this is as documented in the FSM: remove the left HVAC vent and surround, then reach around from the left side and disconnect the speedo cable. Once that's done, the dash will pull out about an inch and you'll have just enough room to work (have bandaids ready) There's also no need to remove the steering wheel, although it would give you a bit more clearance.

If you've ever worked on a 123, you will be surprised that the same minds designed the 190 dashpod. In addition to the speedo cable, there's a multiway plug, plus ten or more individual wire connections and six fiber optic connections. To make it more fun, you have to disconnect and reconnect everything by blind feel. And the final joke is that there's some sort of insulating blanket that will seem to be too bulky to stuff back into place. It gets especially annoying on the right side, where the idiot lights are each individually wired. There's a good chance of putting a bulb in the wrong hole, so be careful. (Yes, doing it with a second multiway connector would have actually killed them.) Work slowly, examine and label each wire and connector, and make a diagram. When the dash pod is out, photograph the back to help you remember what has to be plugged back in. The only break you have is that any fiber optic line can plug into any slot. After a few times, you'll find it never gets easier, but your first time is going to be an epic ordeal.