Hood tachs

I’ve always liked hood tachs but i’ve never had a car with one. I know they came on Pontiacs and i believe on Fords. Did Any other brands use em? Post pics of hood tachs factory installed or add ons please. Would one look good on my 68 chevelle?
I swiped some random interweb pics to get this started

 

I like them inside the car, usually, on top of the dash, just to the right of "straight ahead".

But I did put one outside recently, although there's no hood involved

 

I’ve got one on the dash too, it suits my 56 chevy better than a hood tach. On the right era of cars hood tachs look bad ***. I don’t know how useful they are tho

 

I made a "speed boat" mount out of a stainless street elbow from Summit, used RTV to glue the SW tach in. This is on my dune buggy.