BMW M20/M30 to M50 TPS Adapter Harness | MegaSquirt & Standalone ECU

Plug-and-play connector adapter harness for connecting an M50/E36 variable throttle position sensor to BMW M20 or M30 engine wiring that uses the matching three-pin throttle-switch connector. Designed for MegaSquirt and compatible standalone ECU conversions, it avoids cutting or permanently modifying the original engine harness.

• Connects compatible M20/M30 three-pin throttle-switch wiring to an M50/E36 three-pin variable TPS
• Pre-crimped OEM-style connectors
• No cutting or permanent harness modification required
• Pairs with the Falk MFG M50 TPS Adapter for M20 & M30

Compatibility

Connector fitment must be verified before ordering. This harness is intended for M20 and non-EML M30 applications with the matching three-pin factory throttle-switch connector. It is not compatible with EML/electronic-throttle systems or M30 applications that use a different multi-pin automatic-transmission/EGS throttle-switch connector.

This is a connector adapter, not a universal pinout converter. The installer must verify that TPS signal, sensor ground, and regulated 5V reference are routed to the correct pin positions for the specific ECU and engine harness. Never connect the TPS 5V reference circuit to 12V.

AMP EFI MSPNP-Pro B8793 E30 M20 Reference Wiring

• E30 pin 1 / ECU pin 52 to M50 TPS pin 2 (TPS signal)
• E30 pin 2 / sensor ground to M50 TPS pin 1 (sensor ground)
• E30 pin 3 / ECU pin 53 to M50 TPS pin 3 (5V reference)

MegaSquirt hardware and harness configurations can vary. The reference pinout above is for the AMP EFI MSPNP-Pro B8793 E30 plug-and-play ECU. Verify the pinout before installation if you are using a different ECU or harness configuration.

BMW M20 & M30 MegaSquirt TPS Upgrade Guide

Need the physical mounting adapter? Pair this harness with the M50 TPS Adapter for M20 & M30. The M50/E36 TPS and physical mounting adapter are sold separately.

Save 10% with the complete kit: Buy this harness with the M50 TPS Adapter for M20/M30.