2005 Subaru EJ25

COOLANT TEMP SENDER FOR DASH GAUGES
The stock late model subaru engines that i've worked on had no coolant temp dash gauge senders or wiring harness to accomodate that sender.  They did, however, have a 3 wire connector to the ecu coolant temp sender.  The 3rd wire is not used in that connector.
When installing a vanagon temp sender to power your dashboard coolant temp gauge, you must choose one of two options to get the signal from your sender up to your gauge.
1. Clip the 3rd wire from the ecu coolant temp sender and use it to carry the signal from your vw temp sender, mounted on the coolant manifold, to your black plastic junction box where you can splice to the barrel connector wire which carries the signal up to the dash temp gauge.  You'll have to trace the wire from where you've cut it at the subaru ecu temp sender through the square engine harness connector to ensure you get the right wire.
2. Run a new wire from the new coolant manifold mounted vw temp sender all the way to the black plastic junction box and tie into the barrel connector wire which carries the signal up to the dash temp gauge.

DRIVE BY WIRE ACCELERATOR
The electronic accelerator pedal adaptation to the automatic transmission vanagon was a big chore and took much adjustment and tweaking to get it right.  I ended up making a flange to accomodate the mechanism and installed it just above the torque converter on the vanagon auto trans.  Smallcar installs them on the rear right side of the intake manifold but I had too much traffic there already....fuel lines, electric leads from alternator, a/c lines, all were in that location and made it hard to use their instructions.

CRUISE CONTROL
I ended up getting a 1995 subaru servo, taken from a 95 ej22, mated with
the vanagon vacuum pump and onnected to my drive by wire accelerator
mechanism.  On the test drive the vacuum pump had a bit of issue
keeping the speed steady what with working hard to operate the drive
by wire mechanism which has more tension than either the stock subaru
or vanagon accelerator linkage but it did work well on the flats.  I
mounted a flange on the rear of the auto trans (where the final drive
connects to the transmission) to hold the end of the cruise control
accelerator cable and extended the cable with some hardware (one of
those adjustable chain linkages from an audiovox cruise control kit
that the a/c guy gave me - thanks Toby!) to connect to the drive by
wire mechanism mounted on the bellhousing.

ALTERNATOR TICKLE WIRE
There is an extra wire in the charging harness for the late model subaru alternator.  On my 2005 this wire was a light blue/red coloured wire. There were also the typical black/white wire (for the vanagon alternator light) and the 2 mammoth B+ cables, as well as the (can't remember color) a/c compressor wire.
 I tied the blue/red alternator wire right back into the lug at the top of the alternator (essentially splicing to the white wires).  This gave the alternator the power circuit signal it needed and it began charging appropriately.  The alternator WILL NOT charge your battery if this wire does not get a positive signal, either from the ignition + or B+ circuits.

WHERES THE IGNITOR?
There's no ignitor (or maybe it's built into the distributor) on this model of subaru engine.  All my searching was for not.

O2 SENSOR WIRING EXTENSION
On some subaru engines, there is an extension harness to extend the length of the o2 sensor connectors from the engine harness back to the sensors.  Not so on this engine.  The wires were just barely long enough.