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PREMIUM QUALITY FOR UNEXCELLED RELIABILITY
The tachometer measures one of the most important operating parameters of an engine - RPM.
Your engine represents a substantial investment. Protect it with quality instrumentation.
Only top quality "mil-spec" workmanship and premium grade materials are used. This includes
moisture-proof glass/epoxy circuit boards with double thickness copper and an exceptionally wide
temperature range Liquid Crystal Display. The non-magnetic construction uses only brass,
stainless steel, and passivated aluminum hardware. The gasketed glass to metal seal is
impervious to moisture.
Easy to install on gasoline or diesel engines. Just three wires connect. Self-contained unit
easily replaces existing standard-size tachometers. Choice of either polished stainless steel
or black anodized aluminum bezel.
>~~
Sender Model
8901
For Diesel Engines
Tachometer Model 8905
LCD Readout
Trim Ring
Optional Flat Black
Trim Ring Bezel
TACHOMETER SPECIFICATIONS
Tachometer range
0 to 9999 Revolutions Per Minute
Tachometer resolution
One Revolution Per Minute
Tachometer accuracy
Within plus or minus 1 revolution
Tachometer readout type
Four fully active LCD digits
Tachometer display intensity
Soft backlighting for night viewing
Data update rate
Approximately once per second
Ratio settings: switch selectable
(other ratios by special order)
Gasoline engines
3, 4, 6, 8,12,16
cycles (4 cycle)
Direct driven alternators
3,4,6,8,12,
16 poles
DieseL
2, 3,4,6,8,12,16
pulses/rev.
Diesel sender output
Eight pulses per sender revolution
Diesel sender drive ratios
0.25:1, 0.5:1, 0.75:1, 1.0:1
Diesel sender fittings
SAE Marine 7/8-18 mount, 0.187 tip
Nominal input voltage
13.6 volts DC
Input voltage range
6.8 to 38 volts DC
Power consumption (@13.6 VDC).. 30 mA typical, SOmAmaximum
Operating temperature rangE)
-10 C to +80 C (+14 F to 176 F)
Storage temperature range
-55 C to +82 C (-67 F to +180 F)
Operating humidity range
0 to 95% R.H., non-condensing
Package construction
Passivated aluminum, non-magnetic
Interconnection terminals
Brass studs (3), #8x32
Warranty, limited
Two years
HOUR-METER SPECIFICATIONS
Hourmeter display size
1" x 0.03"
Hourmeter range
6 digit display
(1st digit
=
1110thof hour)
Hourmeter update
Update every 6 minutes
Hourmeter accuracy
Within plus or minus 0.02%
Input voltage range
9 to 38 volts DC
Operating temperature range
-40 C to +85 C
Start time
250 engine Revolutions per Minute
Data retention
Ten years data retention (w/o power)
Specifications
subject
to change without notice.
(E
1£
AETNA ENGINEERING
0-379 Lake Michigan Dr. NW, Grand Rapids, MI 49544 USA
Toll Free: 1-800-776-7962 Phone: 231-223-9867 Fax: 231-223-9467
Email: aetnaengineering@fireboy-xintex.com Web: www.fireboy-xintex.com
REV. 6/04
101028
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