Here is a hard to find Stewart-Warner 5,000 RPM "Recorder" tach. Not only were these instruments capable of measuring your revs, they rerecorded the number of them. It works well & comes with the mounting bracket & a good socket & light. Other than a very minor scuff like blemish on the bezel at about the "50" mark, it's in quite nice overall shape. It fits into the standard 3-3/8" hole & is the standard 2:1 ratio. The price is plus shipping...$15 to the lower 48. PayPal (F&F) or a Postal Money Order would work. The first P.M. committing to buy gets it.