I think the 'Diccionario Enciclopédico de Términos Técnicos Inglés-Español, Español Inglés' written by Javier L. Collazo, published by McGraw-Hill is a good one. I have the sixteenth printing, 1996 but I don't know if there is a more recent one.
Another one I like is English Spanish Comprehensive Technical Dictionary by Lewis L. Sell, (195) but it has been out ot print for a number of years.
A very Happy New Year to you all
Eulalia