I took apart the dash cluster from my Gen 1 parts truck today. I wanted to see what all the light are in the cluster and take the speedo and other face plates out for a future project. I also wanted to see if there was a spot for a glow plug light. Well I have never seen one come on but I believe it is the one in the bottom left corner.
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There is a brown wire with a white stripe connected to it at the Din plug.
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I still have the wiring harness and will attempt to trace it.It would nice to have it come on at strart up.

89 Pajero 2.5 TD