I haven't been posting much, but I have been progressing at my usual glacial speed. I found these glow plug ignitor modules out of China. I think they are voltage regulators but have some desirable features. they can accept elevated voltage input, say from a 2 or 3S lipo battery at 8 or 12v respecively, but delive the requisite 1.5-2.0 volts to the plug. Each plug can draw 2-5A depending on some variables which makes them a bad match for any kind of standard cell for all 5 cylinders, especially old school NiMH cells. Anyways I ganged them in parallel, made some copper bus bars & basically have a dedicated switch for each plug. Turn them on to start, turn them off when running/glowing. I can test combinations like lower cylinders only at idle. I tested on a mockup & the plugs all lit, so magic smoke escaped. I also found these nice harness plugs which engage the glow plug stem. They have a contact spring inside.