Hello,

Ok, I am assuming your doing the dash lights in the 240 (123), my 84 300D Turbo should be the same as yours, although I cannot say for sure.

You need to gently use flat screwdrivers and pry the speedo assembly out of the dashboard. They make a special tool for this, but I managed to use screwdrivers before and got away with it. Then you would unscrew the speedometer cable to get enough room to get back there, or in my case, remember where everything went and just unplug it all.

After you get the dash assembly out, remove the light bulbs and replace them one by one. I recomend changing all of them, they are not that expensive, like 10 bucks or something if I remember correctly, it will save you the hassle of pulling the assembly out a few months later if another one was going to go out.

then reverse the process and before you decide to push it back in firmly, take it for a test drive and see if the speedo wobbles, and make sure all the light come on, etc. If all is a go, then firmly push it back in place and your set.

Johnson