I just started on my 67 safari's fridge and have the same issue. No Manometer to test the pressure, so will have to seek one out, but it's been a few years since it was used on Gas only. Quite honestly I'm not sure I ever confirmed it worked on Gas other that it lit those lights.
Flame looks about like the ones above. Perhaps a tad weaker.
I do have a question on the thermostat.
1) How many turns do you typically get from min to max? I can turn the dial @ 3 revolutions before it maxes out. Presently I don't see any change in the flame when doing this. After reading the post above it doesn't appear I will, but would expect some change.
2) Does this thermostat only control Gas? I'm assuming so, but there was some rigging done with a replacement in the cool box that makes me wonder if the bottom one (gas) failed and the gas system was bypassed for electric only. I suspect two (1 for electric and 1 for gas), but never seen one mentioned in the cooling box.
Thanks in advance... Alt