I used that blue one for a while. I had issues with two or three of them before I went to the electronic version of the old black box type (69 Road Runner). So far for the last three years, no issues.
68 Road Runner (383/4speed, post car w/decor pkg) - Major Project 69 Road Runner w/472 Hemi & 4 speed. 70 Challenger R/T SE EF8 w/ V9J, U - A32 - Major Project 2023 Ford Mach 1