Who sells a good tachometer?

I'm looking to buy a good tach for a Kohler twin, Onan twin. There isn't a lot to choose from. I'm looking for a real old school style tach that will fit the same 2 1/6" hole in the dash where the old ammeter is now. I don't want one of those TinyTach cheap can't change the battery tachs. I want one that has a pick up off the coil, like the auto/truck tachs. I not so worried about price within reason. Does anyone know were I may buy two or three, I have more then one machine with a twin cylinder that needs a tachometer. Thanks for your input.