You must keep your original engine instrument
Features quartz crystal and accuracy of 1 RPM. Resolution is 10 RPM and includes red line alarm. Specify engine and magneto models, number of cylinders, voltage and red line.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
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Yes, these are STC'd.
Per JPI, this is not approved as a primary instrument.
Per the manufacturer: 2.0 x .950 x 3.5 inches box (mounting ears 2-3/4 wide)