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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If you’re anything like me, before jumping into a job, or while ordering parts, you want to refresh your memory by looking at the area you are going to be working on. Problem is, with an E30, getting clear pictures of the underbody or stripped back engine bay or interior is fairly difficult. Luckily...
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Ever wondered if there is a place where you could find BMW parts that are coming out of being NLA? Good news, BMW is now running the below page with just that information! https://www.bmwgroup-classic.com/en/offers-and-services/bmw-classic-reproductions.html
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The E30 cigarette lighter socket is a bit of an oddity when it comes to retaining a lot of different accessories. They usually wiggle their way out after a few miles or tilt and disconnect. Search no more though, these two are confirmed to fit well and snug: Information regarding the magnet phone hanger...
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Understanding battery group sizing can seem confusing, but it really comes down to regional nomenclature. Like metric and imperial there are DIN sizes (Deutsche Internationale Norm) and BCI (Battery Council International) group sizes. What’s convenient is that most BCI sizes have DIN equivalents and vice versa. Some makers will even place both designations. 40R...
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You’re more likely to get a bad balance than you are a good balance, and it all comes down to the operator and sometimes the accessories they have to work with. The golden rule to a good balance is repeatability; and that doesn’t mean just re-spinning. After a balance is confirmed the wheel needs...
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