I am restoring my uncles 68 firebird. Is almost completely original except for some electrical. I am trying to find out where some of the junction boxes came from and if i can get new ones. Not original bit convienent. Here is a picture of the part in question. Anybody know what ot may have come with or where i can buy a new one?
Thanks for the help.

Nothing like that on my '68. Plus, I can only think of wire harness plug-in factory connections. Maybe it had an aftermarket tach?

Thanks. Got rid of it and carried on. Can't wait till my uncle can hear his baby running nice again