Sandpiper Posted January 18 Share Posted January 18 Hello everyone - my first post here - I have been lurking for many months, hopefully this is the right sub forum for this request. Can anyone point me in the right direction for the part number and sourcing a Speedo Connector to fit part number 71255 or 30D175A? I would assume if you bought the speedo from the Speedo manufacturer that they would supply the connector with the Speedo, they are obviously part of the Caterham main vehicle wiring loom so they are not supplied from Caterham with the connector. I am converting my '99 SLR car from grossly inaccurate mechanical gauge to electrical in the interests of preserving my license and getting an accurate odometer 🙂 Picture shows socket on speedo that I need to interface to. Many thanks S Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted January 18 Member Share Posted January 18 (edited) Welcome You're in the right place! But you've started with a tough problem. I don't think that we've ever documented all of those connectors. I'd ask Redline if they can help, and you don't need a part number for that. Technical Guide to Speedometers Speedometer and Instrument Repairs And do you need any wiring diagrams? Jonathan Edited January 18 by Jonathan Kay Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted January 18 Member Share Posted January 18 23 minutes ago, Sandpiper said: I am converting my '99 SLR car from grossly inaccurate mechanical gauge to electrical in the interests of preserving my license and getting an accurate odometer Have you bought an electrical adaptor for a Type 9 gearbox? I'd be interested in which one and how well it works. Jonathan Link to comment Share on other sites More sharing options...
cobar Posted January 18 Share Posted January 18 A similar question was asked and answered here on USA7s about the tachometer. Based on the photos, it looks like the connector is the same. Provided someone can confirm they are, you'll have your answer. -John Link to comment Share on other sites More sharing options...
Sandpiper Posted January 18 Author Share Posted January 18 (edited) Many thanks Jonathan and John. Jonathan I have bought the Hall effect electrical sensor that I shall fix to pick up on the propshaft bolts - I foolishly removed and discarded the reluctor ring when I replaced my offside driveshaft last year ! it would appear from the link above that this is the part I need https://www.mouser.co.uk/ProductDetail/TE-Connectivity-AMP/175964-2?qs=Gjc27Ks72wOXIFP7jzW7dw%3D%3D&_gl=1*1ftm6tu*_ga*NDgyNzk1MzIwLjE3MDU2MTI2MTQ.*_ga_1KQLCYKRX3*MTcwNTYxMjYxMy4xLjAuMTcwNTYxMjYxNC4wLjAuMA..*_ga_15W4STQT4T*MTcwNTYxMjYxMy4xLjAuMTcwNTYxMjYxNC41OS4wLjA. Edited January 18 by Sandpiper Spelling Link to comment Share on other sites More sharing options...
David Lynch Posted January 19 Share Posted January 19 (edited) There is some information on the Caerbont(CAI)/Smiths website. They may be able to supply you with the subloom which IIRC for mine I got from Caterham. Should be the Post 2004 version, though the pre 2004 document is useful too. info@caigauge.com https://www.smiths-instruments.co.uk/bespoke-projects/product-instructions/ Edited January 19 by David Lynch Link to comment Share on other sites More sharing options...
Sandpiper Posted January 21 Author Share Posted January 21 Thank you David Link to comment Share on other sites More sharing options...
Sandpiper Posted January 23 Author Share Posted January 23 To follow up on David's post. Caerbont sell a prewired connector harness part number 41-762-285-00 for £13.60 plus VAT this connects to their programmable speedos. I imagine this may be a tad cheaper than buying from CC 😁 Caterham speedo part number 71255 are now supplied EES3-1B32-00B Caerbont gauges which are programmable via the rubber button on dial face (no dip switches) as per their support instructions Electronic (2004 to date ) Note the B which means the later circuit board to EES3-1A32-00B which has the dip switch array in the back for configuring. Link to comment Share on other sites More sharing options...
Catgraham Posted January 30 Share Posted January 30 Looks like you have this sorted, but for info I dug out the following a while back: The connectors are AMP / TE Connectivity MULTILOCK .040 Series (first series, not II or III), Speedo and early tacho - 8-pin part no. 174044-2 RS 362-8768 (£0.94 ea) Later tacho - 20-pin part no. 174047-2 RS 362-8796 (£1.03 ea) Contacts for above - 20-22 AWG part no. 173681-1 RS 712-1889 (£5.10 for 50) Other contacts also availabe to fit this seres. Cheers, Graham. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted January 30 Member Share Posted January 30 Great homework. Thanks Jonathan Link to comment Share on other sites More sharing options...
Sandpiper Posted January 31 Author Share Posted January 31 (edited) Many thanks for the info on this. I have the new speedo fitted and running perfectly, I have the additional Earth at the sensor to car loom connector by the O/S front damper and that is connected to the Brake T junction Earth point. The only Tomfoolery was with the Red lead harness pin 3 which for the modern sensor requires +12V for the pull up resistor for NPN sensors. I started with it disconnected no joy - then grounded it no joy connected it to pin 1's power supply lead and job done. The speedo is very smooth in operation and is extremely accurate at motorway speeds. Edited January 31 by Sandpiper spelling Link to comment Share on other sites More sharing options...
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