Bought one for my 69 stang. worked and looked great for about 1 and 1/2 years. now it only will read after 1500 rpm. checked and re-installed wires and changed my ground to make sure that it was my tach and not installer error. Still the same problems. They work good for awhile if you need a cheap temp tach. i will be looking into an equus or an autometer tach next. You get what you pay for.