3. Connect an 8AWG (10.0 mm ) wire, minimum, with an insulation temperature rating of 220°F (105° C), minimum, from the battery "+" terminal on the starter solenoid to the right terminal on the ammeter (see wiring diagram). 4. Connect ammeter lamp (60-0-60-I only) to existing instrument panel lighting circuit. 5. Reconnect the battery Smiths have manufactured gauges for British cars for many years and we supply these genuine Smiths Classic gauges. Mechanical Speedometers are normally set at 1000 revs/mile for MPH and 620 revs/km for km/hour. It is likely you will need to re-calibrate your Smiths Classic speedometer. For help with fitting and re-calibrating of your Smiths White Wire: Connect to +12 Volt Lighting. INSTALLATION INSTRUCTIONS. SHORT SWEEP ELECTRIC GAUGES. 2650-1079-00 Rev. C. Mounting. Replace light bulb with the same . number bulb as the one removed. These gauges can be mounted in-dash or in Auto Meter mounting solutions (panels, cups, pods, etc.). 2. 1 ⁄ 16" diameter gauges mount in 2. 1 ⁄ 16 Linked the thin red and thick red wires together. Put the output of my power supply into the meter. Power supply red output to the two red on the meter. Power supply black output to the two black wires on the meter. The new power supply output then becomes the red positive output and the blue (load) negative output. Bring modern technology into your much loved classic car with the brand new Smiths Classic digital tachometers. These digital gauges measure either 100 mm (4 in) or 80 mm (3.15") in diameter, and feature a polished chrome bezel with black gauge face an -Installation instructions . Features:-Negative earth vehicles only Dynamo Ammeter