Caterham tacho – possible use to show RPM

[Frances IoMParticipant @francesiom58905]

One of the many items acquired at auction sale for little outlay was Caterham tacho – EET3-1A32-00B marked as 0-8000 rrm (dial just 0-80) 4cyl – it as a strange to me 6 pin connector – I can find no info as to how to drive it – my idea is to use a cheap arduino to interface – can anyone advise – it looks undamaged and case is marked ok but I have no guarantee it still works sorry title should be RPM of my mill

Edited By Frances IoM on 15/11/2020 14:46:38

Fixed the title typo for you! Dave

Edited By SillyOldDuffer on 15/11/2020 14:54:42

[Frances IoMParticipant @francesiom58905]

[Michael GilliganParticipant @michaelgilligan61133]

I would start by looking here: **LINK**

https://www.lotus7.club/forum/techtalk/random-rev-counter

and continue by wondering if it’s worth more to them than you could buy an alternative for.

MichaelG.

[Frances IoMParticipant @francesiom58905]

can’t see any help there, could you please point out anything I missed – what I need is the pin-out (+ possibly a reference to the connector tho I guess I could work thru the many hundred RS sell) as well as possibly the functions of the 6 dip switches accessible from the rear – I doubt if it is worth much but having a brother who has a Lotus I’m aware of the cost of repairs. It is just an attractive instrument 80mm diameter

[Pete RimmerParticipant @peterimmer30576]

If it says 4 cyl on it then it's probably an electronic one triggered by the coil low tension side or even an inductive pickup. When you buy after-market ones they usually have a selector switch to set the number of cylinders so that it reads true, because different number of cylinders usually means different number of pulses per rpm.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Frances IoM on 15/11/2020 15:49:11:
can't see any help there, could you please point out anything I missed –

.

Sorry to have wasted your time … I presumed that, as they were discussing the existence of two different pin-outs, it might be worth contacting them.

MichaelG.

[SteviegtrParticipant @steviegtr]

Posted by Michael Gilligan on 15/11/2020 20:15:19:

Posted by Frances IoM on 15/11/2020 15:49:11:
can't see any help there, could you please point out anything I missed –

.

Sorry to have wasted your time … I presumed that, as they were discussing the existence of two different pin-outs, it might be worth contacting them.

MichaelG.

Ditto, i would have thought that to be the perfect place to get info.

[Maurice TaylorParticipant @mauricetaylor82093]

Hi, this might be useful. **LINK**

Maurice

[Maurice TaylorParticipant @mauricetaylor82093]

Posted by Michael Gilligan on 15/11/2020 15:15:37:

I would start by looking here: **LINK**

https://www.lotus7.club/forum/techtalk/random-rev-counter

and continue by wondering if it’s worth more to them than you could buy an alternative for.

MichaelG.

Hi ,this link gives you the name of the maker .Put name in google ,to find website ,this has instructions for gauges .

I think you might be able to drive it direct from a Hall sensor

Maurice

Edited By Maurice Taylor on 15/11/2020 21:51:20

[Jon LawesParticipant @jonlawes51698]

I'd be tempted to sell it and use the money to buy something more fit for purpose.

[Frances IoMParticipant @francesiom58905]

I could easily just use a 4digit display as a purely functional display but I fancied something different – I have no idea if it actually works as I took a punt on it,for I think 1 or 2 pounds, at the local auction where sometimes I have struck lucky in that no-one had recognised a specialised tool or item – tho I usually avoid items I can’t physically handle and inspect, I have been tempted and often get a dud where an obvious non-working device has been repackaged to appear new – eg in one case I bought an extractor fan in original packaging only to discover that the fan blade behind the grill was absent – deceptive sales are not restricted to Ebay but at auction houses there is seldom any come back – caveat emptor strictly applies.

I had discovered previously the same thread but was confused by mention of lights as mine appears to have no visible indicators – catch is I cannot extract it from the case – the front bezel once a rubber seal in moved can be twisted but doesn’t want to come away from the ‘can’ protecting the mechanism

[Maurice TaylorParticipant @mauricetaylor82093]

Posted by Frances IoM on 15/11/2020 23:13:49:

I had discovered previously the same thread but was confused by mention of lights as mine appears to have no visible indicators – catch is I cannot extract it from the case – the front bezel once a rubber seal in moved can be twisted but doesn't want to come away from the 'can' protecting the mechanism

Hi ,Have you had a look at makers website and downloaded instructions ? Why do you need to get it out of case,connections and switches should be on back.

Maurice

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