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Page 22/63 UltraGauge™ EM User Manual www.ultra-gauge.com
Intake Pressure
(MAP)
Gauge name Range Units Abbreviation
Intake Pres abs PSI 0 to 36.98 PSI MAP PSI
Intake Pres abs kPa 0 to 255 kPa MAP kPa
Intake Manifold Absolute Pressure (MAP). This is absolute pressure as opposed to being
relative to atmosphere (gauge pressure).
The pressure reported is the pressure above absolute vacuum. When this gauge reports 14.7
PSI, that means the pressure in the manifold is the same as that of outside air (at sea level).
RPM
Gauge name Range Units Abbreviation
RPM 0 to 16,384 RPM RPM
Rotations per minute of the engine crankshaft
MPH / KPH
Gauge name Range Units Abbreviation
MPH 0 to 158.4 MPH MPH
KPH 0 to 255 KPH KPH
Vehicle road speed
Fuel Pressure
Gauge name Range Units Abbreviation
Fuel Pressure PSI 0 to 111 PSI Fuel PSI
Fuel Pressure kPa 0 to 765 kPa Fuel kPa
Fuel rail pressure at the engine relative to atmosphere (Gauge pressure)
Ignition Timing
Advance °
Gauge name Range Units Abbreviation
Timing Advance º -64 to 63.5 degrees Tmg Adv
Ignition timing spark advance in degrees before top dead center for cylinder #1. Does not
include mechanical advance, if any.
Intake Air
Temperature
Gauge name Range Units Abbreviation
Intake Air Temp ºF -40.0 to 419.9
ºF
Intk ºF
Intake Air Temp ºC -40.0 to 215
ºC
Intk ºC
The temperature of the air in the intake manifold. When the engine is cold, this is equivalent
to outside air temperature
Mass Airflow 1
Gauge name Range Units Abbreviation
Mass Air Flow 1 g/s 0 to 655.35 grams/second MA1 g/s
The Mass Airflow rate of air into the intake manifold. This is the raw un-calibrated sensor
output. The sister gauge, “Mass Airflow 2” is the calibrated or calculated version
Throttle Position
Gauge name Range Units Abbreviation
Throttle Position 1 % abs
0 to 100 %
abs TP1%
Throttle Position 2 % abs abs TP2%
The percentage that the throttle is open. This is the absolute output from the throttle position
sensor as a percent of the TP Sensor’s max value. The closed and wide open throttle positions
will likely not be equal to 0% and 100% respectively. For example, the physically closed
throttle position may correspond to an absolute position of 8%.
“Throttle Position 2” is for vehicles with a second throttle Position Sensor
O
2
Sensor
Voltage
Gauge name Range Units Abbreviation
O
2
Voltage Bank1 Sensor 1
0 to 1.275 Volts
O2 V B1S1
O
2
Voltage Bank1 Sensor 2 O2 V B1S2
O
2
Voltage Bank2 Sensor 1 O2 V B2S1
O
2
Voltage Bank2 Sensor 2 O2 V B2S2
Raw output from the O2 sensor. 0 volts is equivalent of 100% lean fuel air mixture and 1.275
volts is 99.2% rich fuel air mixture. Bank1 is the cylinder bank with spark plug #1.
Typically only two O2 sensors are present, one on each bank. Some vehicles will support a
wideband O2 sensor before the Catalytic converter and a narrow band after the Cat.
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