The needle reads 35°. The PDF’s troubleshooting guide tells you: "Low dwell angle = points gap too wide. High dwell = points gap too tight." You adjust the points, re-check, and the misfire vanishes.
The original manual is laid out in dense British technical prose. In PDF form, you can hit Ctrl+F and type "dwell" or "no spark" to jump instantly to the diagnostic flowchart. Gunson Digimeter 320 Manual Pdf
So download the PDF. Print it out. Laminate the calibration page. And keep that Digimeter running for another 40 years. The needle reads 35°
