Blue Anodized Aluminum Adapter, -08 Female JIC 37 deg Flare To -08 Female JIC 37 deg Flare, Straight

That's exactly what it's built for. Two -08 female JIC 37-degree flare ends connect directly through this fitting in a straight configuration, so you can join those two lines without needing any intermediate male fittings or extra hardware. The 37-degree flare seating keeps the connection leak-resistant, which is standard for JIC practice at that dash size.