Can anyone shed some light on this...I'm attaching a picture. It isrange box)on a pP-51 with a os 61. My Dad did all the building on this years ago, and I guess I didn't pay much attention at the time
. There is a lead that goes to the glow plug and another lead that goes to the switch with the two LED's (green and amber). Has anyone seen one of these before and if you have can you explain the inner workings of it. Thanks, Mike