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1983 Honda CB450SC Nighthawk Mechanical MPH & KPH Choices

Use the stated specifications to plan a speedometer change on your 1983 Nighthawk. Both custom gauges have an 85mm housing and 57mm mounting centers, but those measurements are only part of the decision. Confirm the drive, surrounding clearance and missing fitting details before ordering.

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Honda CB custom vintage style mph speedometer front view

Custom Vintage Style Speedometer MPH

$99.95 USD
03-0760
Custom Vintage Style Speedo (MPH) - Mechanical speedometer ratio: 2240:60. Before ordering, confirm the drive ratio, cable or electrical connection, gauge diameter, and mounting...
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Honda CB custom vintage style kph speedometer front view

Custom Vintage Style Speedometer KPH

$99.95 USD
03-0761
Custom Vintage Style Speedo (KPH) - Mechanical speedometer 60 km/h = 1400 rpm Before ordering, confirm the drive ratio, cable or electrical connection, gauge...
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1983 Honda CB450SC Nighthawk · Speedometers Buying guide

Check the whole installation around the stated dimensions

The two speedometers share approximate 85mm diameter and 55mm depth, plus LED illumination. Their scales and calibration differ: 0–130 mph at 2240:60, or 0–220 km/h at 60 km/h and 1,400 cable rpm. Neither is described as a direct stock replacement; the custom mounting requirement needs an installation-specific check.

Parts to consider

Custom Vintage Style Speedometer MPH MPH mechanical gaugeSpecified for 2240:60 calibration with a 0–130 mph scale. Allow for the approximately 85mm-diameter, 55mm-deep housing and verify the cable connection as part of the custom mounting plan.View part Custom Vintage Style Speedometer KPH KPH mechanical gaugeSpecified for 60 km/h at 1,400 cable rpm with a 0–220 km/h scale. It lists 57mm mounting centers and LED illumination, with accuracy dependent on the complete drive arrangement.View part

Do not use one measurement as a fit guarantee

A 57mm center spacing is useful for comparing mounting points, but it does not establish housing clearance, bracket shape or stock-cluster fit. Check the stated housing dimensions and the actual space around the instrument, and confirm the cable thread and direction.

Resolve what the package and wires actually provide

The current descriptions do not enumerate supplied mounting hardware or the illumination’s voltage and wire assignments. Ask for those details before ordering a bracket or planning connections. A front-view product photograph cannot establish the hidden fittings or electrical specification.

Questions to settle before buying

Does matching 57mm mounting spacing prove the original bracket will work?

No. The listings require custom mounting; 57mm center spacing is only one comparison. Check the approximately 85mm diameter and 55mm depth, surrounding housing clearance, cable connection and intended bracket arrangement before treating the original mounting as suitable.

What illumination details do I need before planning the wiring?

LED illumination is specified for both gauges, but operating voltage and wire assignments are not stated. Obtain those details for the chosen instrument and compare them with the motorcycle’s intended wiring arrangement before ordering or planning connections.

What mounting contents should I confirm before buying a separate bracket?

The current descriptions state custom mounting and 57mm centers, but do not enumerate supplied bracket hardware. Ask what fittings arrive with the instrument, then compare that information with the mounting plan and housing clearance before adding a bracket purchase.

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Send your model and year, plus photos of your existing part and any changes to the original setup.

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