The input voltage: 12V
Measuring range: 0-9000 RPM
Applicable models: 12v car racing
Accessories: instrument, instrument support,
installation line Wiring methods: Two groups of line (the first group) four lines; Red meet often electricity + 12v.
White headlight switch + 12 v Yellow after ignition switch + 12 v Black battery or car shell Two wires (second group)
Green for sensor signal lines, black earth wire Third line for the tandem line, can need not, when to buy two such instrument, power series.
Instrument jack: Two feet of socket connect external alarm lamp (the instrument package does not contain lamp)
Three feet is line socket, Four feet is the power cord jack, two Kong Xuan could be a hole, when you buy two such instrument,
​the second hole can be used in series line link, it is no longer need to connect power.