Setup
MK4 Complete Kit with vintage gauges and T5Z transmission.

I am using the supplied speedometer sending unit and I notice that there are 2 connections. 1 connects directly to the RF harness and the other appears to be for a mechanical type of speedo cable. That being said, do I need to purchase a plug for the empty/unused mechanical hole in the sending unit? My concern is that fluid will leak out this unused hole.

Thanks in advance for your help.