TISCO Ammeter Gauge 30-0-30A for 2" Panel Cutout — Direct-Fit Tractor Replacement, Rear-Terminal

The Tisco A0NN10670A ammeter gauge is a direct-fit 30‑0‑30 amp electrical meter built to replace original tractor ammeters and monitor charging system current.

This compact, non‑luminous instrument is designed for a 2-inch panel cutout and replaces many legacy part numbers across major farm-tractor brands. Its straightforward needle display lets you see charging or discharging currents at a glance, helping you spot wiring or charging issues before they become major problems. The housing and electrical terminals match common OEM layouts so installation is typically simple for hobbyists and professionals alike.

Will this gauge fit my tractor’s dashboard?

Check the physical cutout and mounting style first — this model requires a 2" diameter hole and standard back-terminals used by older tractors. It was manufactured as a replacement for numerous OEM part numbers, so cross-reference your original part or the models list to confirm compatibility.

• Panel hole size: 2 inches diameter
• Mount type: rear terminals and retaining nut
• Replacement for many OEM codes (see product notes)

Which tractors are supported by this replacement ammeter?

The Tisco A0NN10670A covers a wide range of classic agricultural machines from several manufacturers. Instead of a single model, it’s compatible with numerous tractors from Allis‑Chalmers, Ford, Case, International Harvester, and Massey Ferguson, especially older series that used the same electrical gauge format.

• Allis‑Chalmers: models such as B, C, WC, WD45 and more
• Ford: 8N, 9N, NAA/Jubilee, plus 600–900 series
• Case and International Harvester utility and industrial tractors
• Massey Ferguson: MF35, MF65, Super 90 and similar models

How do I install and wire this ammeter safely?

Installation involves securing the gauge in the 2" panel opening and connecting the positive and negative terminals according to your tractor’s wiring diagram. If you’re unsure about polarity or battery connections, consult a wiring schematic for your specific make and model or have a qualified technician complete the hookup.

• Turn off battery power before wiring
• Connect charging output to the meter’s charge terminal and battery feed to the battery terminal
• Use correct terminal hardware and insulate connections

What electrical range and display features does it offer?

This non‑illuminated gauge displays current on a symmetric 30‑0‑30 amp scale, showing both charge and discharge conditions. The analog needle makes trends immediately visible; there’s no internal lighting, which is typical for original equipment style replacements.

• Scale: 30 amps charging to 30 amps discharging with zero center
• Non‑luminous face for authentic vintage appearance
• Durable needle movement suited to agricultural environments

Who is this for: The Tisco A0NN10670A is aimed at owners and restorers of classic tractors, fleet maintainers, and mechanics who need a reliable OEM‑style ammeter for older equipment. If you’re restoring a vintage tractor, replacing a failed original gauge, or standardizing instruments across a workshop fleet, this unit provides a faithful fit and familiar reading scale without modern digital complexity.