What to look for when buying E24--M635Csi?

Hi, first post here!

I'm a big VW guy, but love all euros. My friend knows a guy who is selling an E24 and I have a chance to pick it up, but as I'm pretty clueless to the BMW scenes and specific issues, what would you suggest I look for when I check out the car?

From what I've been told, the car is a 1986 M635CSI in all original excellent condition (no modifications), 60k original miles. He mentioned there was something possibly wrong with the electrical and that the dash cluster fails at times. The owner has multiple cars in his collection and is willing to let this one go.

So what should I look for/common issues? How much is a car in this condition worth?

I'm intrigued by the condition (if it truly is what like I've been told) and the looks of this car, I would love to own a classic bimmer and have heard great things about E24s.