igital tachometers might be accurate but they don’t respond
like an analog instrument. This new SILICON CHIP
tachometer combines the best features of analog and digital instruments: blip
the throttle and the LED bargraph rapidly responds to the change in engine revs
while the true RPM will be shown on the 4-digit display with up to 1 RPM
resolution.
A gear shift light and a rev limiter output are standard
features and it can operate with virtually any car or motorcycle (except magneto
ignition). Its vast array of optional setting adjustments makes this tachometer
a truly versatile instrument. For performance cars and motorcycles, this
versatility includes the ability to display engine RPM above 10,000 RPM.
The circular display section of the tachometer has been made as
small as is practical and it can be installed within the instrument cluster of
your car if there is sufficient space available. Alternatively, it can be housed
in a cylindrical case and mounted using a suitable holder on the dashboard,
windscreen or instrument cluster. The main electronics part of the tach-ometer
needs to be mounted under the dashboard (or within a side cover in a
motorcycle).
The LED bargraph is arranged in a 76mm diameter circle that
covers a 286° span. Most of the 32 LEDs are green except for the extreme
clockwise end which uses five red LEDs to indicate the "red line" RPM. You can
increase the "red line" indication to as many as 10 LEDs.
During calibration, the red line RPM can be selected, as well
as the number of red line LEDs. The tachometer then automatically calculates the
RPM increments required to light each LED.
