Technical VINTAGE Stewart Warner Tachometer Flathead? WTH?

Anyone here know what this is for? Flathead maybe?

 

Anyone?

 

That looks much later. I'd say late 60's- mid 70's

 

Yes I agree 1960's.... The Tan plastic piece? Flat head under the distributor maybe? As it looks to be a mechanical Tach... Thoughts?

 

This thing is heavy duty KEWL! Here are a few more pictures....

Thoughts?

 

Her are some pics of a complete setup. Your tack is from the 50's and the tan piece is specific to what distributor it fits! Most likely some truck engine or marine app. Gary