help me with my money pit!
 

I drive a 1993 Mercedes 300e. Currently, the blinkers and the horn don't work. The hazards do, oddly enough. The only relay switch I can find is one that costs $600 to replace...it also controls the hazards and cruise control (they both work, so I assume the relay still works)

Of course, I'm very new when it comes to Mercedes and was hoping that someone, more knowledgeable, had a better idea what it could be.

Also, the idle lopes a tiny bit. It is barely distinguishable. But the oil pressure gauge lopes with it (only when it idles)


Thoughts?