BMW E30 SI Board info and troubleshooting - Bavarian Restoration
BMW E30 SI Board info and troubleshooting - Bavarian Restoration
My temp gauge and tach were not working so I replaced SI batteries but realised that there is a small repair done on pcb trace and some of the transistors are blown.
New BMW 84-87 E23 E24 E28 E30 1.2-V Ni-Cad S.I. Board Battery (Batteries) | eBay