I just added more pictures and information that I believe will be extremely helpful to current/future VX owners, or for anyone running Versions 1.0 thru 1.5 of the DIY WB O2 kits from Tech Edge. It's a lot of reading but it's worth it. Just PM me or post here any questions you might have since this has kind of turned into the end-all VX information thread.
There are two ways of monitoring the LAF:
Positive lead of the DMM/DVM to pin D14 (orange with blue stripe)
Negative lead to pin D16 (blue with green stripe wire)
for a reading of -1.xVolts to +.XVolts. + being in lean burn mode.
Positive lead to D14
Negative lead to chassis ground or D22 (sensor ground)
for a reading from +0.xV to +3.1V (lean burn is when readings are above 2.7V)
If you're just trying to monitor the AFR with a wideband, see the link below. The LC-1 with the Bosch sensor is $199. It allows both an analog output (monitor with DMM) or a serial output so you could datalog your AFR's.