Editing Z31/speedopinion php (section)

== How the Speedometer Works ==

The speedometer and odometer are cable-driven by a pinion gear located on the
'''right side of the transmission’s rear'''. This gear meshes directly with
the transmission’s output shaft.

Pinion gears come in '''16–23 teeth variations''', each matched to differentials
(assuming correct tire size). They are '''color-coded for easy identification'''.

⚠️ Important: If you use a pinion with
'''20+ teeth''', you must replace the sleeve that holds it. These offset sleeves
are required to prevent damage to both the pinion and the transmission drive gear.

=== Speedometer Pinion Gear Table ===

Pinion gears are color-coded and matched to differential ratios. For gears with
'''20+ teeth''', an offset sleeve is required. Not using it may damage both
the pinion and transmission drive gear.

{| class="wikitable"
! # Teeth
! Color
! Differential Ratio
! Part Number
|-
| 16
| Yellow
| 3.36
| 32703-78100
|-
| 17
| Black
| 3.54<br />84–86 Turbo
| [https://www.nissanpartsdeal.com/parts/nissan-pinion-speedo~32703-78101.html?vin=&make=Nissan&model=300ZX&year=1984&submodel=&extra1=&extra2=&filter=( 32703-78101]
|-
| 18
| Blue
| 3.70<br />84–87 NA, 87–89 Turbo
| [https://www.nissanpartsdeal.com/parts/nissan-pinion-speedo~32703-78102.html?vin=&make=Nissan&model=300ZX&year=1984&submodel=&extra1=&extra2=&filter=( 32703-78102]
|-
| 19
| White
| 3.90<br />88–89 NA
| [https://www.nissanpartsdeal.com/parts/nissan-assy-pinion-19t~32703-78103.html?vin=&make=Nissan&model=300ZX&year=1984&submodel=&extra1=&extra2=&filter=( 32703-78103]
|-
| 20
| Red
| 4.11
| [https://www.nissanpartsdeal.com/parts/nissan-pinion-speedo~32703-78104.html?vin=&make=Nissan&model=300ZX&year=1984&submodel=&extra1=&extra2=&filter=( 32703-78104]
|-
| 21
| Purple
| ~4.3
| [https://www.thezstore.com/product/7387/new-factory-21-tooth-speedometer-pinion-assembly-80-89-280zx-300zx-z31-w-manual-trans 32702-58S21]
|-
| 22
| Orange
| ~4.8
| [https://nismoparts.nissanusa.com/parts/nismo-sleeve-speedometer-pinion-3270758s00?c=bD01Jm49RHluYW1pYyBTRU8gUGFnZQ%3D%3D 32707-58S00]
|-
| 23
| Green
| ~5.1
| Part numbers and availability unknown
|}