MSefi.com read only forum (Jan.15,2018)

And here's where I put the welds in the distributor,
for rpm: and vacuum advance:

I had a k-jetronic m10 I 'squirted. Bought a L-jet manifold and from there it was just plugging in and driving. Welded the distributor stiff and used it as spark input (extra code).

You're within the ve-map but outside the autotune window, have a read about the limits here:
http://www.megamanual.com/megatune.htm#autotune

The Audis b2,b3,c2,c3 (mid/late 80) with fuel injected engines also have them, look underneath the plenum.