I converted my Harbor Freight 8" drill press to a 2HP treadmill motor and driver. I had to build a new base to house the motor driver circuit, but because it has an 8-12 VDC power source for the PWM controller, I was also able to power the RPM sensor and display, both of which mount into the printed parts and click together, eliminating the need for fasteners or hardware. I was also able to salvage the rocker switch from the flex light that used to be on this drill press, so there's a slot for that as well.

PWM Signal Generator https://www.amazon.com/gp/product/B07NJ1SL3N/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

RPM Sensor https://www.amazon.com/dp/B07CHLS379?psc=1&ref=ppx_yo2ov_dt_b_product_details