Technical Sun Super Tach repair

I have a Sun Super Tach Model SST-802-2 that I can't get to work. It blows the fuse on whichever circuit that the 12 volt ignition terminal is wired to. I tried another identical tach and it works fine, so I can assume that the wiring on the car is correct.
Does anyone know of a place that can fix this. I really would like to use this tach, the face is in excellent condition and the chrome is perfect.

 

Probably cheaper to buy a new one. Common eBay item.

 

The Tach Man www.tachman.com

 

I'll contact the folks at tachman.com and see what they can do.
Thanks

 

Did you get this fixed? I have a similar situation.

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No I never got it fixed. I used the other tach I had, but now a 4amp inline fuse on the 12v feed to the tach and water and oil pressure gages keeps blowing as soon as I turn the key to on. If this tach is bad I'll probably replace it with one of the new reproduction versions like this. https://www.summitracing.com/parts/bgs-fst8000
The new ones probably have better electronics than the originals, and cheaper than getting them fixed.

 

I have a sentimental reason to fix the one I have. It's the tach my dad used in my car 50 years ago.

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If you get yours fixed, let me know I might send one to tackman .