Intermittent tachometer 1974 S2 / Shift Knob replacement

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lancie
Posts: 6
Joined: 03 Jun 2020, 16:45

Intermittent tachometer 1974 S2 / Shift Knob replacement

Unread post by lancie »

hi all - new to this car -

1) car is in generally great shape but the tachometer "hangs out" around 3500 RPMs when I'm just driving down the road - it'll start moving if I really step on the accelerator of if I am at a stop - is the best way to do this to rebuild the tachometer?

2) cannot seem to find the HF shift knob anywhere - does anyone have a source? Also, when I turn my knob, the entire shaft spins - is this normal? How does one replace the shift knob?

Thank you!!
Huib
Site Admin
Posts: 1847
Joined: 17 Dec 2008, 10:12

Re: Intermittent tachometer 1974 S2 / Shift Knob replacement

Unread post by Huib »

About the tachometer. I posted on this before. Search this forum on "schematic" and you will get there.
lancie
Posts: 6
Joined: 03 Jun 2020, 16:45

Re: Intermittent tachometer 1974 S2 / Shift Knob replacement

Unread post by lancie »

Huib wrote: 15 Jul 2020, 10:43 About the tachometer. I posted on this before. Search this forum on "schematic" and you will get there.
Thanks - unfortunately I am not able to really understand the schematic due to my limited electronics knowledge. Can you simplify the issue for me? Does the tachometer need to be rebuilt? Thanks a lot.
Huib
Site Admin
Posts: 1847
Joined: 17 Dec 2008, 10:12

Re: Intermittent tachometer 1974 S2 / Shift Knob replacement

Unread post by Huib »

Is the instrument made by Veglia Borletti or Jaeger?
lancie
Posts: 6
Joined: 03 Jun 2020, 16:45

Re: Intermittent tachometer 1974 S2 / Shift Knob replacement

Unread post by lancie »

Huib wrote: 16 Jul 2020, 21:24 Is the instrument made by Veglia Borletti or Jaeger?
Veglia - thank you.
Huib
Site Admin
Posts: 1847
Joined: 17 Dec 2008, 10:12

Re: Intermittent tachometer 1974 S2 / Shift Knob replacement

Unread post by Huib »

In that case the circuit diagram of the electronics which I made and published applies.

The input resistor should be checked and possibly replaced. You will have to find someone who understands electronics and can read the color codes.
lancie
Posts: 6
Joined: 03 Jun 2020, 16:45

Re: Intermittent tachometer 1974 S2 / Shift Knob replacement

Unread post by lancie »

Huib wrote: 16 Jul 2020, 21:57 In that case the circuit diagram of the electronics which I made and published applies.

The input resistor should be checked and possibly replaced. You will have to find someone who understands electronics and can read the color codes.
Thanks - are there any reputable sources to have this done by a specialist?
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