E30 Early “Square C101” to Late M20/M42 Wiring Harness Adapter

If you plan on swapping in a later model E30 engine into your 1984 or 1985 E30 chassis, our plug and play harness adapters are the easiest way to go. These adapters will convert your early style “Square” C101 fuse box connector to be able to connect to your late style Round C101 harness connector.

• Installation Instructions included
• Extra wire for MPG
• Extra wire for Tachometer signal
• Extra wire for Vehicle Speed Signal
• Oil level sensor pre-wired into the adapter
• Sensors are not included

* Please leave the following info in the notes section when placing an order:

• Model: 316i, 318, 318iS, 325, 325E, 325i, 325iS, 325iX or M3.

* This is a special order item, please allow 2-3 days for assembly. All adapters are made to order. Because of this, neither returns nor exchanges are accepted.  All sales are final.