Technical Older Stewart Warner Tach.?

I always ***umed, and maybe incorrectly that this S/W tach. was not complete but needed a sending unit to plug into the 3 prong electrical end to make it work. Could these 3 prongs simply be +positive, ground and ire to dizzy/coil, no other hook up required? Thanks!

 

Nope. It needs a rare sender that fits between the distributor and the cap. And each sender is particular to that particular distributor. There are a couple dozen tachs floating around for every sender still alive today.

 

Coming from you I will take it as the gospel and not wait around for a second opinion! Thanks for info!

 

I'll second what alchemy said.

 

As above. You could get the guts out of a new one and instal it inside that housing.
Or make a million bucks with it on Ebay.

 

I think you can have those rebuilt to work without the dist. adapter.