I like it. The first pic I take it is a before pic. If you still have those wheels and tires wheels and tires put some '98ish Mountaineer center caps on (requires three lug nuts per wheel and crushing the dust cap on front hubs).
http://www.grandmarq.net/vb/showthre...l=1#post824149
It's been quite a while since I've been in an '89-earlier dash, but you'll have to remove the dash trim to replace the cluster bulbs.
Screws or bolts that point straight up on the top lip of the trim and others around the edges of the trim panels. The passenger side panel slips behind the driver side panel and the driver side panel clips into that part of the passenger side panel (possible I have my sides confused) and that is a common break point for those that aren't used to disassembling these things. I don't think the trim around the radio has to be removed, but in case I am remembering wrong there are two screes hiding above the ashtray and maybe a couple more up top.
After removing at least the trim panel around the cluster (I forget if the p-side needs to be removed due to the interlocking joint with the d-side panel) the screws or bolts holding the cluster in should be obvious.
Once the cluster is loose don't try to just yank it out. The shift indicator may need to be disconnected, but I don't remember how that is accomplished. Also, the speedometer cable on the back of the cluster needs to be disconnected along with two electrical connectors. The speedo cable I'm not sure what the trick to disconnect that is, but I remember it being a pain (probably because I didn't know the trick to disconnect it).
The bulbs are 194 bulbs.
I think you're referring to the red engine light which should only come on for one of two things: low oil pressure or engine coolant temp too high. If the sensors aren't lieing then you may have some troubleshooting to do.
Edit:what he said.