Tach Drive lubrication

[txdodge43man]

I know the tach drive does not have a grease fitting on it like the speedo drive has but how does it get lubrication? I had to pull me radiator on my M35a2 last weekend b/c it was starting to separate from vibration. While I have it out I'm changing all the belts and radiator hoses and was wandering if there is some way to lubricate the tach drive?

 

[DieselBob]

I have wondered that myself. I can't find mention of any lubrication for it. Looked in the LO, -20 and -34 manuals. I guess it must be considered factory lubricated and sealed.