Re: Digital vs. Analog engine gauges
I've never seen the Microlog shunt, and for $90 a shunt could be custom sculpted and gold plated by a dedicated machinist.
But I have seen typical US-made shunts, and some cheapass Chinese shunts, and it doesn't take long to figure out which one is going to be more stable long-term. Sometimes quality tells. Good fitment, solid contacts, tight screw threads...If $90 is excessive, well, you've got to figure you're buying into their whole package, and it all should average out.
Of course, we also used to scavenge old toasters from the trash to get free nichrome wire (damned expensive to buy new!) and some stuff just gets sold for way more than what it would seem worth in this world.