tacho issues 1hz auto

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Joined
May 29, 2025
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Location
Australia
Hi everyone,

I’ve got a weird electrical issue with my 105 1hz cruiser which is stopping it from shifting gears. When cranking it shows 500rpm but when it starts running it goes all the way up to 4500rpm at idle while it’s actually sitting at 600rpm. As tempature increases it increases rpm on the gauge, as well as removing earths.

So far I’ve replaced 3 clusters, 2 engine speed sensors. Pulled apart both kick panel junction boxes and 2 transmission ecus and still no bingo

Engine speed sensor has .69v either side and ecu ig into trans ecu has 1.5v less than b+ input

Other faults are horn and antenna not working

I’ve been chasing it for 6 months had 2 auto electricians look at it with no luck. Do you guys have any ideas?
 

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