Bulletin No. AQPB-101
Issued: 08/01/05 by RR - Revised 05/18/16
Subject: Tachometer
File In Gauges/Controls Section
Older Models
Current Models
Older Models
Current Models
A121790 (NLA)
A383409
A249256 (NLA)
A383216 (Kit)
Datcon
Murphy
Stewart Warner
Murphy
0 to 4000 RPM range
0 to 4000 RPM range
0 to 3500 RPM range
0 to 4000 RPM range
12V or 24V
11 - 28VDC
12V
11 - 28VDC
White lettering
White lettering
White & green lettering
White lettering
Chrome Bezel
Chrome Bezel
Black Bezel
Chrome Bezel
Light Blue Plastic housing
White Plastic housing
Shiny metal housing
White Plastic housing
Label Markings:
Label Markings:
Label Markings:
Label Markings:
103733 127A40HDP
ATA-40 20700134
82644
ATS-40 20700227
Sender: A249257
Tach Only: A383216-TACH
Sender Only: TBA
Replaced by A383409
Note: This tach was formerly
Replaced by A383216
Note: This tach was formerly
a 0 to 3000 RPM range tach
a 0 to 3000 RPM range tach
which Murphy discontinued
which Murphy discontinued
in circa 2011. Here is
in circa 2011. Here is
the former tag info…
the former tag info…
ATA-30-12 20700175 (12V)
ATS-30-12 20700188 (12V)
B-SERIES TACHOMETERS
The tachometer (tach) pre-supplied in the rear control panel by our panel maker is by
default an alternator pulse type. Occasionally we find that the alternator on the truck
chassis does not have a tach signal terminal. In these cases the tach in the panel has to
be swapped out with a flywheel magnetic pulse (mag-pulse) type tach. A mag-pulse tach
utilizes a sensor (sending unit) mounted over the flywheel ring gear. This swap is not
reflected in the owners manuals or the unit's BOM (Bill of Material). Please use the
information below to insure you are ordering the correct tach.
ALTERNATOR PULSE TACHOMETERS
FLYWHEEL MAG-PULSE TACHOMETERS
CONTROLS 6
AQUATECH OPERATIONS, SERVICE AND PARTS MANUAL
A Product of Hi-Vac Corporation
CONTROLS
