This listing is for a Porsche 911 912 tachometer 

This tachometer came from a older 911/912 collection 

Not sure how to test it, it spins and moves freely with no clanks or parts floating around 

Candidate for a restore store sold as pictured 

Selling as a core due to being untested 

The brim does have surface rust 

Parts number 902.741.302.01 90274130201

Sold as pictured