Socio, I put a tiny sheet metal screw in right at the top of the pillar. You really cant see it (tiny head, painted black. You have to put your head by the guages to see where it is). The bottom is an interferance fit.
I later realized I bet i could have pulled a gauge or two out drilled inside the pod, fastened the pillar in there, and then put the gauge back in. No holes or screws to be seen. (one would do this drilling on the bench before installation, but you get the idea about what I mean, I think). It is fastened via screws inside the pods themselves.