Message text written by "Jeff McNeal"
>Hello again. My Jaeger Tachometer on my '67 Spitfire is miscalibrated
apparently. An electronic tach confirmed my suspicions that my mechanical
tach is showing the engine revving a good 500 RPM higher than it actually
at highway speeds. Has anyone calibrated their own tachometer? How is it
I calibrated the tach in my MG once but I don't like to talk about it.
The electronic tachs have a variable resistor inside that adjusts the span
and you can have someone hold the engine at a predetermined speed (say
3,000) while you adjust the tach to that reading. What could be simpler?