Hello guys, currently going good on my ke30 restoration. Installed a 3 gauges defi A1 setup on my ke30, the rpm gauge is accurate on idle but whenever i rev it, even tiny revs, it goes up uncontrollably, up to 7K even hahaha.

my coil and dizzy setup:

12v original spec coil with an electronic dizzy

Sounds like a job for Banjo... You will need to know what the Defi gauge voltage should be, and what is arriving at the gauge.

I have the opposite problem- since I converted to coil-over-plug there is no coil to produce the pulse for the factory tacho, and the Haltech fires the coils with only 5V. The tacho reads at idle, but not above... I need to fit an amplifier to make the 5V pulse larger, I'm not sure what your one needs, unless the gauge is expecting a lower voltage than what it is getting.

Also, check the gauge for options on cylinder numbers, you can often set them for 2 or 4 or 6, 8 cyls and it divides the pulses to suit.