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I agree, for this purpose I utilize independent timer DTMR1 or any other suitable activated by momentary switch and when all 8 LED are bright you knw for sure that all 8 GP are working. and if one fail there is no guessing which one. Like I said this just another approach.

There is yet different approach, using 24V and eliminating resistor . Two glow plugs for each cylinder connected in series. First eight mounted on special plate with eight threaded M10x1 holes. That plate has to be insulated and mounted inside aluminum enclosure. That enclosure is mounted on...