Below is a quick visualization on where you can expect to find any of the 27 relays or control units found in the E30.  
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When talking through E30 componentry or work to be done, its helpful to have a full visualization of the front and rear subframe assemblies.  
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Below is the coolant flow direction of all the piping and equipment on a M20 engine.
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Most publicly available fuse layouts are perfectly fine, but for those who want reassurance, the below is the layout described in the factory E30 repair manual.  
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Early and Late E30 fuel systems mainly differ by the fact that early runs a two pump system and late runs a single pump. With that primary difference, routing of fuel lines and vapor lines is also notably different.   Early:   Late:
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Below is the factory pinout of an E30 Cluster:
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Normally, we are told to fill AC systems by weight. That is normally because pressures change greatly depending on temperature. These seldom seen AC pressure charts allow us to directly cross check and test our systems for optimal performance.    
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There are numerous OEM E30 spring part numbers, and the below is the breakdown of what net effect each will have on ride height and how they interrelate with what options you may add or subtract in your E30.  
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E30 Factory manual pinout and illustration showing the routing of the central locking system found on E30’s:    
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Directly from the factory repair manual:
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