Sight Glass on Fiberglass Tank?

Finnigan

Over 1,000 Posts
Have a Benjies tank that I want to add a fuel gauge to, toying with the idea of a sight tube on the side. Anyone think of a reason why it wouldn't be a good idea to drill/tap/seal some fittings directly in the fiberglass? Will it crack?
 
Fibreglass isn't thick or strong enough to "drill and tap".

You'd have to epoxy in a bung of some sort.
 
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