garm 0 Posted May 30, 2016 My tach is showing exactly double the actual RPM's. It works pretty well though, not jumpy. Best way to fix? Quote Share this post Link to post Share on other sites
sheffieldcortinacentre 753 Posted May 30, 2016 is it an aftermarket one? is the switch (usually on rear) set to 4cyl? Quote Share this post Link to post Share on other sites
garm 0 Posted May 30, 2016 No, it's original. Quote Share this post Link to post Share on other sites
Dave53 0 Posted June 2, 2016 No, it's original. Have yoy got electronic ignition fitted? If so sounds like the same problem as I have series 1 have RVI Tacho's fitted (curret sensing connected in series)) ,later models are fitted with RVC Tacho which are wired differently (connected in parallel) and work with electronic ignition. Hope this may be of some help Quote Share this post Link to post Share on other sites
garm 0 Posted June 2, 2016 Yes, I have the Pertronix fitted and it's a Series 1. Quote Share this post Link to post Share on other sites
Pete-H 69 Posted June 2, 2016 Yes, I have the Pertronix fitted and it's a Series 1. These two solutions for that problem were sent to me by the Pertronix Support team. Tach.pdf Quote Share this post Link to post Share on other sites
garm 0 Posted June 2, 2016 Awesome, I will try those! Quote Share this post Link to post Share on other sites
