WhiteV Posted February 25, 2008 Share Posted February 25, 2008 Hi --- Been offered a Spitfire 1500 electric tacho--- will this be suitable for a Vitesse or is it best I decline and look for a late GT6/2000 saloon electric tacho -- regards Link to comment Share on other sites More sharing options...
thealligator Posted February 25, 2008 Share Posted February 25, 2008 For Vitesse 6 cylinder then GT6/2000 not the Spitfire one Link to comment Share on other sites More sharing options...
Nick Jones Posted February 25, 2008 Share Posted February 25, 2008 Well, it won't read right. Will read 50% high due to having 50% more cylinders and thus 50% more sparks per revolution....There are allegedly ways of recalibrating (google is your friend) but I didn't have much joy with them in spite of trying hard. You may well be cleverer at electronics than me though - many people are.I currently have a late saloon one (2500S?) which is the easiest to wire in. Earlier ones from the PI are also possible but require slightly more wiring effort. Neither are a cosmetic match (I don't much care fortunately, but you might) and swapping the needle and dial are not very easy either due to different sweep angle and balancing methods.If you have electronic ignition, this can also cause triggering problems on the earlier 'wire through' types (PI etc) although the later 'wire to' are pretty tolerant.Not sure if any GT6 had an electric tacho? Late saloon one is the best bet.CheersNick Link to comment Share on other sites More sharing options...
mk2vitesses Posted February 26, 2008 Share Posted February 26, 2008 I've not seen inside an electronic Triumph tacho so I cannot be sure, but the Ford Cortina Mk1 GT unit had a pot inside to adjust the charge pump circuit.If you have an audio signal generator it would be possible to adjust / modify the unit if it meets the Ford unit design.The circuit is a simple RC time constant driving a moving coil meter.There are companies that re-furb / overhaul these units, you could try them.Simon Link to comment Share on other sites More sharing options...
Vinnyfastcar and Carol Lamity Posted February 26, 2008 Share Posted February 26, 2008 is that one made in a microwave? Link to comment Share on other sites More sharing options...
WhiteV Posted February 26, 2008 Author Share Posted February 26, 2008 Hi---Thanks guys for the good response. I bow to you who have more knowledge.So it looks like a 6 cylinder electric tacho sometime. You saved me checking outall the Spit and Dolly ones on Ebay -- Regards Link to comment Share on other sites More sharing options...
mk2vitesses Posted February 29, 2008 Share Posted February 29, 2008 I have found this in my archives, it may be of use to someone.Simon Link to comment Share on other sites More sharing options...
WhiteV Posted February 29, 2008 Author Share Posted February 29, 2008 Hi -- thanks for the diagram ---oh by the way i know you guys indicate 4 pot and 6 pot are different --- recently on ebay one was advertised listing both engined cars?i trust the eventual buyer found it of some use? --- kind regards Link to comment Share on other sites More sharing options...
Nick Jones Posted February 29, 2008 Share Posted February 29, 2008 Note that circuit diagram is for the early type tacho - the 'wire through' one as used on the PI etc. The Spitfire1500/Dolomite/2500S/Stag ones with the 'wire to' configuration is mostly an intergrated circuit. I have never seen a circuit diagram for that one (and I have looked) and have never been able to identify the chip properly.No Triumph tacho I've seen is switchable between 4/6/8 cylinders and as I said earlier, although there are 'guides to alterating/calibration on the net, none of them have worked for me.Smiths did also make after-market tachos some of which were switcheable between 4/6/8 cyl.Nick Link to comment Share on other sites More sharing options...
thealligator Posted February 29, 2008 Share Posted February 29, 2008 WhiteV wrote:Hi -- thanks for the diagram ---oh by the way i know you guys indicate 4 pot and 6 pot are different --- recently on ebay one was advertised listing both engined cars?i trust the eventual buyer found it of some use? --- kind regardsYe there are switchable ones out there Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.