Does anybody know what this is 1966 Barracuda

I sold my '65 tach and pancake for $400 (half the buying price of the car!) and uses a Sun Super Tach 2 in the same housing. I could wipe out the SUN writing on it but the sweep would still look different but it works with modern distributor and Mallory box and its as accurate as a modern tach. That 'ol SW was a dog, seemed like it was only for decoration as it was very slow. Could bounce the needle off the 6000 peg by just revving it.