Description
The PAI FGG-0500 is an aftermarket dual air pressure gauge that replaces Mack 7MT320RP2 / 7MT320P2 / 25166143 on classic Mack R, RD, RM, RW Superliner, DM, and U Series trucks. Two independent needles monitor primary and secondary air-brake circuits from 0–150 psi on a chrome-bezel mechanical movement, and the gauge drops directly into the 2-1/8 in dashboard cutout used on Mack R-series instrument panels. Mounting hardware included.
Signs You Need a New Air Pressure Gauge
- Gauge needle stuck or not moving when air system pressurizes
- Inaccurate pressure readings compared to a known-good gauge
- Erratic needle movement or bouncing
- Cracked or fogged gauge lens obscuring visibility
- Faded gauge face that’s difficult to read
- Air leak at the gauge connection or fitting
- One or both needles broken or missing
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | FGG-0500 |
| Part Type | Dual Air Pressure Gauge |
| Gauge Type | Mechanical |
| Pressure Range | 0–150 psi |
| Needle Configuration | Dual (primary & secondary) |
| Dashboard Cutout | 2-1/8 in (standard) |
| Bezel | Chrome |
| Includes | Mounting Hardware |
| Vehicle Compatibility | Mack R / RD / RM / RW / DM / U Series (1967–1998) |
| Warranty | 2 Years / Unlimited Mileage |
Cross References
This part replaces or is equivalent to the following part numbers:
- Mack: 7MT320RP2, 7MT320P2, 25166143
Applications
This dual air pressure gauge fits the following Mack truck models with the 2-1/8 in dashboard cutout:
- Mack R Series — R600, R688, R690 (1967–1998)
- Mack RD Series — RD600, RD688, RD690
- Mack RM Series
- Mack RW Superliner
- Mack DM Series
- Mack U Series
Verify your dashboard cutout size and OEM part number before ordering to confirm fitment. This gauge is designed for classic Mack R-Model trucks with mechanical gauge clusters.
