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1972 Japan, 1978 Australia and 1973 USA Datsun 1200s used a speedometer switch to activate various systems.
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Japan Speed Buzzer
Starting in 1972, all JDM cars came with speed switch-activated buzzer (Kinkon Chime) for warning of excess velocity.
POST Sunnydaze: JDM speedo cluster has a buzzer that sounds as you pass a nominal 105km/h! That was at an actual 98km/h. The noise is somewhere between cute and annoying
ブザースピード警告
24814-M0215 BUZZER-speed warning ALL 1972 B110
ブザー
24814-M0215 BUZZER (from '72-2) B120
24814-N4500 BUZZER ASSY 7510-8910 ALL, OPTION 8910-
スピード ワーニング ブザー リレー
24815-H3121 RELAY-speed warning buzzer (from '72-12) (断続ブザー用) B120
24815-G1000 RELAY-speed warning buzzer 7212-7803 B120 < 24815-H3121
24815-G1060 RELAY-BUZZER 7804- [for round gauge cluster]
速度警告音ᵂ: Speed warning sound (KOKOKUKO) is a sound emitted when the speed of a vehicle or the like reaches a certain level or more.The speed warning regulation was ended in 1986, due to the dangers of sleep induction caused by repetitive warning sound.
In the Japan car when the vehicle speed is about 105km/h in the passenger car, and more than about 85km/h in the light vehicle, the alarm sound such as the mechanical chime and the buzzer was ringing for attention to the driver.
JDM 1972 speedometer has special switch/amplifier/buzzer, to warn when speeding. The circuit board on the back of the cluster is modified:
* Center turn signal connector is moved * Small Box is mounted in center * Clock/tach IGN feed circuit has and additional tap
This same cluster housing appears to be used by USA Datsun 620 pickup.
1972
Box: * Yellow wire: 12V IGN * Black wire: Goes into cluster housing
1972 GX with directly-connected speed buzzer
Sunny Truck cluster round gauge (1978-up) with speed buzzer connected to relay
Sunny Truck 1977 cluster square gauge with buzzer at top of cluster board and buzzer relay attached to speedometer
速度警告ユニット (キンコンチャイム)
Amplifier Switch and Buzzer
21600-AN8100 application unknown, but looks like the 1200's unit and the wire colors match
Australia Ute Amplifier Speed Switch
1978-1985 Australian utes used the amplifier for B120 ute Throttle Opener Assembly (see Emission Controls).
The speed detecting switch is part of the speedometer assembly and is installed in the speedometer. The amplifier prevents damage to the speed detecting switch which actuate the throttle opener only when the car speed is above 10km/h. Pub No. SM6E-EMC0A0, Page EC-11
Matsushita 68600-AN8500
* Red: IGN
* Black: goes to Red wire coming out of top center
of cluster (speed switch)
* Green: Output signal
68800-AM7200 speed sensor
* Yellow spade: IGN feed
* Red: speed switch (speedometer)
* Green: Ouput signal
USA Amplifier Speed Switch
USA model from July 1972 (1973 model year) used an amplifier speed switch.
* 25035-H7000 ASSY-AMPLIFIER SPEED SWITCH > 25035-P4502
1973 USA model B110 used an amplifier speed switch for Throttle Opener system.
Blue/Red wire: output signal to T.O.
USA Datsun 620
Datsun 620 pickup USA also uses the amplifier speed switch for the BCDD system
620 cluster with Amplifier Speed Switch attached to back of speedometer
Red: switch signal Yellow spade: IGN Yellow bullet(?): output signal > green harness wire
620 with AM7200 switch - wiring differs (see Ratsun}
Part Numbers
24814 speed warning buzzer 24815 buzzer relay 25039 buzzer relay 25035 speed switch amplifier (emissions usage) 68800
68800-AM7200 or 68600-AN8500 * AUS B120 1979-1984 ? 25035-H7000 ASSY-AMPLIFIER,SPEED SWITCH $69 USD * Datsun 1200 1973 USA * Datsun 620 1972 USA MT 25035-B6401 $88 USD * Datsun 620 1974 USA MT 25035-B8000 $70 USD * Datsun 620 1975-1979 USA MT