Capping 1/8" Oil Pressure Gauge Line

[samkost]

I'm starting the break down my '72 C10 truck for body and paint work.

I plan to drive the truck onto a car trailer for transport.
With my dash cluster removed, is a 1/8" brass pipe thread cap the only and proper method to prevent oil leakage during these short run periods?

I need to locate / purchase the proper cap to avoid damage to the brass line fitting and of course, not make a mess.
Just wanna make sure.

Thanks for any help on this.

Sam