hey there,
i have just installed new LED lights in my vr commodore dash and removed my needles to make them clear so the blue will shine thru but now my speed is not correct and my revs seem right but probally arnt. I am just using the speed alert to make sure i stick to the right speed is there anyway to adjust them so they read correctly ??
Trial and error, remove and refit until it/they is/are in the correct place. External tach. eg. multimeter for the rpm, km marker posts on freeway and a helper with a stop watch for the speedo. You might recalibrate the speedo against another car instead.
I ended up setting the speedo to give the same reading as my gps, took a while to get it in sync but prob more accurate then ever.
Not sure how to set the RPM needle properly. but I took my car out with a GPS and pretty much stuck the needle on the speed the GPS was showing..