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With Megasquirt, you first need to decide whether you want to build your own box from a kit or go the easier route with a PNP version meant for E30/E34/E32. Regardless of versions, you need a way for the box to get it's reference, and that is a trigger wheel on the front balancer. Easiest and most straight forward, a front balancer and sensor off of a M30B35. But to utilize these, you need to make a harness to replace your existing injection harness, easiest by using a wiring harness also from an M30B35 as a base, scaled down to remove extra wiring that you won't be using. Honestly, it's specialized work, best left to someone who has experience doing this kind of conversion, so your car isn't disabled for a year while you learn how to do it yourself.