I don't know anything on price, but I thought this thing was pretty cool, and would allow you to know exactly what your turbo is doing, and whether it's too big, or too small, or any number of things.
On my turbo cars when I would try to run a lot of boost and I'd have spike, and falling off issues, I spent endless hours trying to figure out if it was a wastegate issue, intercooler, piping, leak, or simply too small of turbo. A gauge like this would have been a godsend.
http://www.turbobygarrett.com/turbobygarrett/products/Accessories_continue_speed_sensor.html#
On my turbo cars when I would try to run a lot of boost and I'd have spike, and falling off issues, I spent endless hours trying to figure out if it was a wastegate issue, intercooler, piping, leak, or simply too small of turbo. A gauge like this would have been a godsend.
http://www.turbobygarrett.com/turbobygarrett/products/Accessories_continue_speed_sensor.html#