Did you ever resolve the Temp Gauge problem??
I read this earlier today and thought of your problem.....
(although it might not be related seeing as you're OBD2B Converted to OBD2B)
Special Considerations:
For those of you with 2000-2002 Accords, your engine temp gauge will stop working after converting to OBD1. This is because of the gauge cluster of 2000+ models, which are designed to work off of a pulse width module (PWM) signal which pulses, instead of holding a steady voltage like OBD1 and pre 2000 models.
In order for your temp gauge to work, you can do one of two things.
1. Purchase a $70 ECT adapter module from Modifry Products which converts the steady voltage from and OBD1 ECU to a PWM signal.
2. Find yourself some spare "B" and "C" OBD2B ECU plugs with a few wires still pinned in, and repin them for only the power, ground, sensor ground, ECT in, and ECT out. Basically running the stock ECU for the sole purpose of converting the ECT signal. This is the poor man's fix (my favorite kind), and I'll go into more detail about how to perform it later.
Which I found right here:
http://www.6thgenaccord.com/forums/showthread.php?t=16856&highlight=OBD1