Can anybody tell me if the dash D4 bulb is a standard bulb?, or if it is a dealer part>. I would like to get one before I start taking things apart.
There seems to be a couple of different part #s that it could be, from this drawing. I can't tell if it is #1 #2 #4 or #5

 

The D4 bulb should be part #20. I believe it is a dealer part, as the leads from the bulb appears to be part of the plastic base and possibly may not separate without breaking.

 

I found a youtube that showed how to replace, thanks.

 

I don't think it's number 20 because it's not shown to be present in the rear view. I've been starting out this trying to figure it out

 

It should be number 20 in the diagram. (See attached pics.) The board may need to be removed to access those bulbs.

 

Ah, I see it now. Old eyes.

Right before he posted he found more information on the problem, I found this diagram with the labeled parts...

 

The D4 light went back on on the way home last night, go figure? Seems to run OK. Don't see signs of improper shifting. Checked fluids, all are OK.