Does anyone know whether there is some scale used for multiple Intelligence? And is it officially validated by those responsible of the theory of multiple Intelligence? Any instruments with a reliable construct?
In the Connectome project for Autism diseases, full IQ tests were evaluated both verbal IQ (VIQ) and performance IQ (PIQ) based on the Wechsler Abbreviated Scale of Intelligence (WASI) (Di Martino A, Kelly C, Grzadzinski R, Zuo XN, Mennes M, et al. (2011) Aberrant striatal functional connectivity in children with autism. Biol Psychiatry 69: 847–856.)
The NIH toolbox could be another resource: http://neuroscienceblueprint.nih.gov/factSheet/toolbox.htm
I have to admit that Gardener's theory is quite attractive, maybe because it is so easy to understand. However, I hope you are aware that Gardner's theory has been criticized as having strong conceptual weaknesses and could not be confirmed empirically so far (Visser 2006).
Some researchers go even so far to say that the multiple intelligences therefore should no longer be seriously discussed within academic intelligence research. This might be the reason, why there is still no valid intelligence test building on the theory of multiple intelligences that come close to the quality of "classic" intelligence tests (Amelang 2006).
A validation study with 187 participants came to the conclusion that Gardner's intelligences fall less in the category of performance measurement, but rather in the field of personality traits (Furnham 2009). One problem is that only half of the eight scales (intelligences) reach the internal reliability of alpha = .70, which is generally viewed as a reasonable measure of reliability.
But maybe you have already all that in mind or it is not in conflict with your research purpose. Then you may find useful hints in the first and last publication I listed above.