Time to resurrect this thread!
I was asking myself this very question. My beef with aftermarket gauges is primarily how they look. Where possible, I've done my best to keep my Skyline looking stock.
That being said, I do wish the gauges (especially the oil pressure gauge) were a little bit more trustworthy. I've added a new sender of course, but there is always that nagging doubt in my mind.
So, I thought of an interesting solution! Why not add an audible alarm that buzzes super loud if you loose oil pressure? Here is a product I found that might fit the bill. Apparently, this is a common thing in marine applications. Not sure if it would be that great for a track car with an open exhaust and a brain bucket on the drivers head, but then again, if my car was a track car, I wouldn't be worrying about how the gauges look.
Here's a link to the buzzer kit:
https://www.myinboardmarine.com/products/alarm-for-engine-with-audible-warning-kit?variant=31226510901353¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic