Is it possible to splice yellow plugs onto a gray plug harness?

LoveMy7MGTE

New Member
Nov 24, 2005
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Grosse Pointe, Michigan
I have an 87 turbo, srock ecu (yellow plugs) i bought an 89+ harness (grey plugs) would it be possible to splice the plugs from my old yellow plug harness onto my new harness in order to reuse my ecu? or am I stuck having to buy a new ecu?

EDIT

Not sure if this matters but its a 5spd car, and if i do need a new ecu, and i get a 89+ ecu will the harness for my gauges etc plug into it?