I got one of the new HP Digijet ECUs from Boston Engine and installed it
Saturday.  My engine is a stock '85 1.9l (DH) engine, recently rebuilt by
Boston Engine Exchange.  It is just broken in with about 3500 or so miles.
There is a clear hp increase.   It pulls all the way through 3rd and 4th
gear and has noticeably more low and mid rpm grunt.  I am running 4 or 5
BTDC timing, other than that, everything else is set to stock specs.  (I
was running this way before the ECU switch.)  I did not have to change any
idle settings.  The ECU is a nice looking package.  Newer style plastic
case, VW logo and part number right on it.  Looks like a factory piece.
My old ECU bracket even had extra holes to accommodate the slightly
different attaching points of the new ECU.   I will check gas mileage on
the next few tanks and hopefully get it smogged.  It is like a 2.1 upgrade
in a box.

                                                                  Jay