figuring out advance timing

Backally said

View attachment 1715756543 I


I had trimmed the original chart, here’s a pic of the whole thing. Computers locked up so sorry about the crappy pic.

Click to expand...

Yea. That's the deal, its MAP not vacuum. Find a converter that lets you do that, or just use the table in the other thread to ballpark it. Eventually you may start thinking in terms of MAP but for your own sanity probably best to have conversion handy.
The conversion table assumes 101 kPa is atmospheric pressure.