100 series 1HZ erratic rpm gauge readings (1 Viewer)

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Joined
Apr 22, 2016
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Location
Cambodia
Hi,
I hope I am here in the right section. I have a 2000 100 series Toyota Landcruiser with a 1HZ and AT.
I have a few issues with
- the rpm gauge gives me erratic readings and goes smooth up to 1100rpm but while giving throttle it kinda stuck and jumps suddenly up to 1800rpm, goes then sometimes smoothly up to 2200 but wenn I get off the throttle it will drop down to 1100 or something like that. It feels like it stucks but I guess its more sensor related or dash ecu?
I am sure there are threads here and others have the same issue. I just can't find anything.

Another issue is the sub tank gauge doesn't work anymore. There are 5v (or12v?) on the sending unit in the sub tank but when I switch in the front, the needle just drops and shows empty. (Sub tank is full)

I hope someone can give me some advise or moves the thread in the right section. I have difficulties finding the right section here or handling the forum correctly.

Thanks
Reini
 

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