I had a couple of injectors get fouled on me and am planning to order replacements. I know that the first cylinder injector on the RD28ETi is the one with the needle lift sensor and plugs into the wiring loom. My question is this - I have replaced my injector pump with a mechanical one, so it is no longer an ETi. Does that needle sensor play any kind of role now or can I change it out for a standard injector without the needle lift sensor?