| Engineering Parameter | Mechanical / Capillary Type Gauges | Electrical / Resistance Type Gauges |
| Operating Principle | Thermal Fluid Expansion (Vapor Pressure) | Variable Electrical Resistance (NTC Thermistor) |
| Standard Dial Diameter | 52 mm ($2^{\prime\prime}$) or 80 mm ($3^{\prime\prime}$) | 52 mm ($2^{\prime\prime}$) baseline standard |
| Measurement Scale Range | $40^\circ\text{C}$ to $120^\circ\text{C}$ / $100^\circ\text{F}$ to $250^\circ\text{F}$ | $40^\circ\text{C}$ to $120^\circ\text{C}$ or $50^\circ\text{C}$ to $150^\circ\text{C}$ |
| System Input Voltage | None (Self-powered via thermal expansion) | 12 VDC / 24 VDC (System dependent) |
| Signal Source Interface | Direct-mount copper bulb sensor | Threaded Sensor Sender (e.g., NPT 1/2, NPT 3/8) |
| Matching Sensor Ohm Range | Not Applicable | Standard European ($10 \text{ to } 180\,\Omega$) or American ($240 \text{ to } 33\,\Omega$) |
| Internal Dial Lighting | Optional perimeter bulb slot | Integrated LED Backlighting (Red/White/Amber) |
| Ingress Protection (Front Face) | IP65 to IP67 (Water and dust proof) | IP65 (Weatherproof marine configurations available) |
| Case Material Construction | Corrosion-resistant Stainless Steel or ABS | Zinc-plated Stamped Steel or Impact-ABS |