Late model M5R2 Into 89 XR7 Wiring Question

Last Thunderfox

Registered User
Hey guys, new here. I'm changing out my M5R2 transmission in a 89 XR7 because the 2nd gear syncros seem to be gone. I have a late model M5R2 ready to go in, but there seems to be a plug/harness missing on the new tranny. The old tranny has 4 plugs, new one has 3. Will having this disconnected do anything? And will I have to jump the the wires in the harness to avoid issues? Thanks.
 
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