I got so excited to see this thread only to find out my truck's specs weren't here. I'm sure my breed of Tacoma's specs aren't in as high demand as 2nd gens, but since I've had a devil of a time trying to find this information, I just went ahead and took some of my own measurements off my stock '98. Here ya go.
95-00 Base 2wd steel wheels: 14x6, 5.04" backspacing (128mm), hub center bore 67.1mm, 5x4.5"/114.3mm lug pattern. I calculated offset to be between +37mm and +40mm.
OEM Tire size: 195/75 R14, but my truck has 205/70 R14s on it now.
If you want to know how I came up with the calculated offset, read on.
I didn't have the exact offset specs but based on my measurements and making a reasonable assumption (based off of CAD drawings I've seen for Ford and Toyota rims) that the wheel's bead rim is 12-14mm wide, here's what I came up with.
6"/2 = 3" * 25.4 (to convert to mm) = 76.2mm
76.2mm + 12mm (for the bead rim) = 88.2mm or 76.2 + 14mm = 90.2
backspacing - distance from outer edge of rim to the centerline = Offset
So, 128mm - 88.2mm = 39.8mm or 128mm - 90.2mm = 37.8mm
Measuring the hub in mm
Measuring the backspacing using the two straight-edge method.