The Life-Like GP18 locomotive can be modified to accept the DN163K2 plug-and-play decoder. The locomotive samples Digitrax has acquired need to have the frame engagement clearance slots under the cab on the fireman-side to be widened about 1mm towards the rear of the locomotive (long hood end).  This can be done with a small file or Dremel type tool, and then the decoder will engage the casting satisfactorily with the power tab on this side. 

The engineer-side slots are OK to fit the decoder power pickup tab on this side.  Be sure to check the motor tabs are safely clear of the frame halves after installation, and that the motor is firmly in alignment and the motor frame is secure does not rotate.

Place a piece of Kapton tape up, over and across the
loco frame as shown above.

Another picture of proper Kapton tape placement.

Another picture of proper Kapton tape placement.

Frame engagement clearance slots need to be widened about 1mm towards
the rear of the locomotive (long hood end).  This can be done with a small file.

Another view of the frame engagement clearance slot that needs to be widened.

Frame engagement clearance slot close up view.

Decoder PCB install.