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I have a 92 Shadow w/automatic non-turbo wanting to convert to a turbo engine w/ 5 spd from a 91 Shadow. What problems can I expect? Is the wiring harness going to be a major problem?
 

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well they're both SBEC style ECM's.. so it *should* be plug & play !

UNLESS for some reason the bulkhead "plug" changed, or there was a more subtle wiring change from 91 -> 92..

which isn't likely, but find & print out the 91 & 92 engine wiring diagrams to compare ...
 

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Forgot to add this...

You are going to have to swap wiring harnesses, there are differences between a TBI and Turbo Wiring Harness.
You are going from 1 Injector to 4, a Single Plug HEP to a Dual Plug HEP, Adding a Baro Solenoid and Wastegate Solenoid and the Vacuum System is completely different.
Chrysler changed the TBI Fuel Pump from Low Pressure to High Pressure for the TBI cars in 91 1/2, you will have to be sure your pump can provide the fuel needed for a Turbo Engine.

CHECKING FUEL PRESSURE
https://www.turbododge.com/forums/f4/f14/358339-checking-fuel-pressure-84-93-turbo.html


PM being sent with wiring.
 
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