Pressure & VacuumMurphy mechanical engine pressure and vacuum gauge instruments - click to enlarge

Our heavy-duty mechanical Swichgage® products combine accurate indication of engine pressure or vacuum with adjustable output contacts for fault alarm and shutdown protection. The Murphygage® range provides the same accurate indication without output contacts.

The products are available with 2, 2.5 and 4.5 inch (51, 64, and 114 mm) gauge diameters. 2 and 2.5 inch models typically feature:

  • Rugged industrial-rated diaphragm movements
  • Steel or polcarbonate case options
  • Polycarbonate lens
  • Bright or black stainless steel bezel options
  • environmentally sealed versions
  • one wire (ground return) or two wire (insulated return) contact options

4.5-inch dial versions include a Bourdon tube sensing element, cast aluminium case, plus adjustable high and low limit contacts or snap-acting switches.

Mechanical pressure & vacuum gauge & Swichgage®:

20P/25P pressure Swichgage 20P/25P series
The 2- and 2.5-inch (51 and 64mm) dial pressure Swichgage®. Metal case, ground return, optional snap-switch.


A20P pressure Swichgage A20P/A25P series
The 2- and 2.5-inch (51 and 64mm) dial pressure Swichgage®. Polycarbonate, sealed case, insulated return, optional snap-switch.


20V/25V vacuum Swichgage 20V/A20V/25V/A25V
The 2- and 2.5-inch (51 and 64mm) dial vacuum Swichgage®.


20DP differential pressure Swichgage 20DP/A20DP/25DP/A25DP
The 2- and 2.5-inch (51 and 64mm) dial differential pressure Swichgage®.


20VWC filter restriction Swichgage 20VWC/25VWC/A25VWC
The 2- and 2.5-inch (51 and 64mm) dial filter restriction Swichgage® instruments


20BPG pressure gauge 20BPG, 20BVG
'B-series' 2 inch (51mm) dial pressure and vacuum Murphygage®


OPL pressure Swichgage OPL
4.5 inch (114mm) dial pressure gauge and Swichgage® instruments


PT167EX Swichgage PT167EX
4.5 inch (114mm) dial lead line pressure gauge and Swichgage®


45 series Swichgage 45 series
The 4.5-inch (114mm) dial pressure Swichgage® for Magneto, CD and battery ignition system.


45APE Swichgage 45APE
The 4.5-inch (114mm) dial pressure Swichgage®.


DHK oil line DHK
Oil pressure tubing kits.



Pressure Switches and Sensors:

76.PS pressure switch76.PS
Direct mount pressure switch


PSB direct mount pressure switchPSB
Direct mount pressure switch


PXT pressure transmitterPXT series
4-20mA pressure transmitters



ES2P resistive pressure senderESP, ES2P, ESDP
Resistive pressure sensors for EG(S) series electric gauges



See also:

PD81xx series pressure pulsation dampener valvePD8100 series pulsation dampeners
Dampen pressure pulsations, eliminate gauge pointer flutter, decrease gauge movement wear


EG(S) electric gauge and SwichgageElectric gauge & Swichgage®
Electric instruments with resistive senders


J1939 PowerView gaugesCANbus J1939 gauges
Gauges for use with J1939 compatible PowerView displays and panels