You should contact ScanGauge to make sure. OBDII compliance was mandated starting with vehicles built and sold on or after 1 January 1996.

According to the compliance listing at:

http://www.obdii.com/connector.html

... pre-1996 model year Tacomas were not 100% OBDII compliant. This doesn't necessarily rule out a ScanGauge working on your 1995.5 Taco, but it does indicate some more research is required ...

Of _course_ I know the difference... I don't want you to kiss a hole in the ground.