I used this one on my 56 PU.
Does 4, 6 and 8 cylinders. Wouldn't necessarily trust it in a high winding 8K small block but in a steady away 6 cylinder it will do you fine.
Plus it looks the part.
https://www.mooneyesusa.com/MOONEYES.../mpg5000tm.htm
As for location attach it to the column as per others or stick it on the top of the dash and use the holes for the speaker to run the wires and secure it.
P.
