Technical Vintage tachometer

Looking for help from the collective Anyone ever see a tach like this.?
It's a Stewart Warner and I think I see the power and light wires on the side but an confused by the three prong plug. And what is the two red hands for?
I want to use it just don't want to let the smoke out of it by hooking it up wrong

 

The 2 red hands are shift points.

 

Yup...I've got the same tach. I love the looks but they take a sender and a wiring I don't know about. I wanted the looks of this tach but not the whiz-bang mystery workings. I bought a modern day tach at the swap meet with a 270 degree sweep [like the S.W.] and transplanted the guts from it into my Stewart Warner version. Removed the back portion from the old tach...Wiring is simple [the usual 4 wires] and it works great! Here are a few photos.

 

The shift points can only be set after taking the tach apart.

 

I believe the Studebaker Speedster had that tach

 

The Studebaker Speedster tach, made by Stewart-Warner, had essentially the same electronics & plumbing, but the face & bezel were different

 

What he ^^^^ said...lucky my 1956 Fury has the same set up and is still all there along with the set up for my Studie.

 

I don't think it needs a sending unit like the Studebaker. It has a mating plug and wiring harness. Just looking for guidance on how to hook it up.

 

X2 , as that special 3 prong plug is the giveaway to that style of distributor sender. An elder friend had the complete tach & dist sender body that I put up on here for ID years ago, and a few responses here gave all the info on it.

 

I found the old thread on this odd type of SW tach.. This one is 4500rpm, but all else is a match
https://www.jalopyjournal.com/forum/threads/early-unusual-sw-tach-driven-off-dist-shaft.1076462/

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You need the sender and the extenders for your distributor clips. Then the connecting cable with the matching 3 prong plugs which is harder than the rest to find. I have 2 complete setups like that one in my roadster and one for my flathead. Gary

 

I've got a similar unit that came with a 61 Studebaker Hawk parts car that I bought, I have the tach wiring and sending unit, although the clips seem to be missing, I shouldn't have been surprised at the number of people that knew what it was

 

Thanks everyone. When I got the car the seller couldn't find the distributor. I'll get with him and hopefully it has the sender on it

 

This is a excellent idea. Did the existing needles just come off and attach to the newer tach? What tach did you use?

 

https://www.jalopyjournal.com/forum/threads/tach-tech-mixing-the-old-with-the-new.174971/

 

Excellent post.. Thank You!!!