On the subject of power panels, plugs can vary wildly in how much current they need to get them to glow. With some plugs I have the meter reading maybe 1/3rd scale while others need it almost all the way up. I prefer to start off with just an orange glow so before fitting a plug to an engine I'll always connect it up to the power panel (on it's lowest setting) then wind it up until I have the brightness I want then make a note where the needle is on the scale. If the engine is hard to hand start then I'll wind it up a little more. This can't be done with a glow ignitor so if you happen to be using a plug that needs a lot of power it may not be glowing bright enough and may be the cause of a lot of hard starting troubles.