Speedometer adapter

[Pshas192]

I'm about to install my engine and drivetrain into my duster. To be on the safe side, I bought a 90 degree speedo adapter. I need to know what type of grease is used in this. I have seen white lithium grease suggested as well and light oils. Can anyone help me?
Thank you!

 

[4spdragtop]

Where did you get that?

 

[Professor Fate]

Did the manufacturer not specify a lubricant?