How to Wire an Autometer Tach | It Still Runs Calibrate your Autometer tachometer to your engine size as follows. If you have a four cylinder Run the red wire from the back of the tachometer to the fuse box of your car. Select an open Strip about 3/8 inch of insulation off the end of the red wire with wire strippers and insert the wire Run the white wire from the tachometer to the wiring for the instrument lights. Connect the white See all full list on itstillruns[PDF] INSTALLATION INSTRUCTIONS 5 Tachometer - AutoMeter INSTALLATION INSTRUCTIONS 5" Tachometer 2650-1244-00 Rev. B QUESTIONS: If after completely reading these instructions you have questions regarding the operation or installation of your instrument(s), please contact Auto Meter Technical Service at 866-248-6357. You may also email us at service@autometer.