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ISSPRO, INC. 2515 N.E. Riverside Way, Portland OR 97211

Telephone: (503) 288-4488  Toll Free: (800) 888-8065

FAX: (503) 249-2999

Form IS128 (Rev C 12/02/2010) Page 1 of 4

ISSPRO 3 3/8” PROGRAMMABLE TACHOMETER

Microprocessor Version

GENERAL INFORMATION:

Operating Voltage: 11 - 30 VDC: NOTE - Instrument comes equipped with a 12V lamp. Replace lamp

with one of proper voltage when installing instrument on 24V systems. 24V Lamp Part # is GE-656

Input: Gear tooth sensor, AC generator, alternator tap.

Programmable Range: 1-255 pulses per engine revolution (gear teeth, magnets, etc).

Transient Protection: +100 V, -400 V

Reverse Voltage Protected

Hourmeter (optional): Operates only when engine runs

CALIBRATION PROCEDURE:

Remove the hole plug by pressing above the center enough to allow a

small coin, screwdriver, etc., to be inserted in the slot behind the upper

edge. Twist to remove.

Each of the eight switches has a different value as shown in the table at

the right. Add the switch values to equal the number of pulses per

engine revolution. These switches will be set “on”. All others will be

off. NOTE: The switch setting must be done with the power “OFF”.

If power is left “ON”, changing the switch setting will have no effect on

calibration until the power is interrupted.

Example: Find switch numbers by subtracting the switch value from

the remaining number. Always use the largest value that can be

subtracted from the remainder for each successive step. For example,

set the following switches “on” for a gear with 103 teeth:

Switch

Value

New

Remainder

Switch

Number

Switch Value

Start: 103 - 64 = 39 #7 #1 = 1

Remainder of: 39 - 32 = 7 #6 #2 = 2

Remainder of: 7 - 4 = 3 #3 #3 = 4

Remainder of: 3 - 2 = 1 #2 #4 = 8

Remainder of: 1 - 1 = 0 #1 #5 = 16

#6 = 32

Or use the calibration chart provided (pages 3 and 4) #7 = 64

#8 = 128

IMPORTANT! When changing switch settings on an installed tach, the power to the unit must be cycled either by turning the

ignition switch off and then back on, OR by momentarily disconnecting the “hot” (red) wire.

SIGNAL GENERATOR (Sender Unit): Generator is installed on tachometer cable drive of engine: NUMBER OF PULSES PER

REV = (Number of sender pulses per turn) X (Ratio of take off RPM to engine RPM). NOTE: If the number of pulses per revolution

(from equation) is not a whole number, the tach will not be accurate. In this case, select a generator so that this number is non-fractional.

EXAMPLE: The number of sender pulses per turn is 15, and the take off ratio is 0.5 to 1 (.e. cam drive).

Number of Pulses per Rev = 15 x 0.5 = 7.5. This will result in an error in the tachometer reading. Select a sender with an even number of

pulses per turn (e.g. ISSPRO R8970). The number of pulses per revolution will then be a whole number, in this case, 15.

FREQUENTLY USED SENDERS # PULSES PER REV FREQUENTLY USED SENDERS # PULSES PER REV

DATCON 4-D-C 71267 8 SUN CP7643 6

DIXSON SG201A, SG201A1, SG202 2 SYNCHRO-START Minigen 30

ENGLER 870-0588 15 TELEFLEX 9604276 8

ISSPRO R8970, R8940 30 VDO (Old Style Engler) ISSPRO 300092 4

KIENZLE-ARGO 8-161-237008 8 ZEMCO 4710 8

MOTOROLA 4-100 (7SG100), 4-111 (7SG100B) 30 ZEMCO 6314 5

ROCKWELL 240R02-001 30

1 2 3 4

Sommario

Pagina 1

ISSPRO, INC. 2515 N.E. Riverside Way, Portland OR 97211 Telephone: (503) 288-4488  Toll Free: (800) 888-8065 FAX: (503) 249-2999 Form IS128 (Rev C

Pagina 2

Form IS128 (Rev C 12/02/2010) Page 2 of 4 ALTERNATOR TAP INPUT: If a tap from the alternator has been provided, it can be used to provide the input

Pagina 3

Form IS128 (Rev C 12/02/2010) Page 3 of 4 3 3/8” MICROPROCESSOR TACHOMETERS SWITCH SETTINGS TO PULSES PER REVOLUTION SWITCHES SET “ON”

Pagina 4

Form IS128 (Rev C 12/02/2010) Page 4 of 4 3 3/8” MICROPROCESSOR TACHOMETERS SWITCH SETTINGS TO PULSES PER REVOLUTION SWITCHES SET “O

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