So in glazing I get information that says glaze should be around 140 to 160 sp gr but the readings are for 1.xxx.
I think that somebody has lost a decimal point from the 140 & 160 figures. [*]
As a point of reference the sg of lead is 11.35, so figures over a hundred are definitely unrealistic.
The 1.xxx figures do sound like sg readings.
Glazes do not have a universally desirable specific gravity range like casting slips. The same glaze can be used effectively by different people and in different processes having quite different specific gravities. We have seen glazes with a specific gravity approaching 1.7, others at less than 1.4. This is not only due to the difference in glaze materials and the way they suspend and interact in the slurry, but it is also common for people to add flocculants and deflocculants to glazes. Here is an example of the instructions for one commercial glaze sold as a powder:
The 0-70 scale sounds like it might be measuring in degrees Baume.
Degrees Twaddle is another relic from the past you sometimes see used, especially for sodium silicate.
* Of course if somebody is writing down (or calling out) lots of figures in the 1.xx range
they may find it easier and less error-prone to leave the decimal point as implied.