1986 300sdl WVO Fuel Injector maintenance

I have a Mercedessource inspired 2 tank WVO conversion set up in my 1986 300SDL. I have put on 14,000 miles since the conversion about a year and a few months ago. Everything is running fine.

What is the sign that I will see when my Monarch injectors need to be replaced? They have been on for all 14,000 miles. I don't intend to pull them off for the "fun" of it, because quite frankly it is a pain on the 300sdl's (getting to number 3 and 4 requires removal of the intake manifold.) So I want to only do it if needed.

Thanks for you advice.

Scott

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