4.4 Other sensors 4 WIRING
TunerStudio has the calibration data for many common temperature sensors in its sensor calibration tool, in-
cluding GM, Ford, and Bosch. You’ll find those under Tools -> Calibrate Thermistor Tables.
4.4.2 MAP sensors
Most MS3Pro installations use a MAP sensor for load measurement. The MS3Pro Ultimate has a built in 4 bar
MAP sensor, but can use an external sensor if desired. If using the MS3Pro Ultimate’s built in MAP sensor, simply
run a vacuum line to the sensor port. No wiring is necessary.
The MS3Pro supports both frequency and voltage based MAP sensors. We recommend GM MAP sensors if
using an external MAP sensor, which are voltage based, because they are inexpensive and readily available in
several different maximum pressures. Be sure to select a MAP sensor that can read as much pressure as you
intend to run. On turbo cars, we recommend giving a slight amount of extra room to allow the ECU to detect if the
boost control has malfunctioned.
MAP sensor type Maximum boost level
1 bar naturally aspirated
2 bar 14 psi
3 bar 29 psi
4 bar 44 psi
Install the MAP sensor with the hose fitting pointed downward, or at most, 30 degrees from vertical. This will
prevent oil or blow-by from accumulating in the sensor, which can damage its circuitry.
Here are what the pins on the GM MAP sensor do:
AMP EFI MS3ProUltimate manual version 1.203, firmware 1.5.0, 5/23/2017 Page 42
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