My tach on my 1986 911 stopped working, I was recommended to North Hollywood, called them up and talked to Frank. Based on my description he gave me an estimate. I mailed it in from MN, it arrived in 3 days, they called to confirm delivery and what they were to fix. They fixed the tach within 3 days of receiving it and mailed it back. They charged what they had estimated, I reinstalled the tach and it works perfectly. Thank you