Problem with cranck RPM :(

[LucasSchneider]

MS 1 whit 2.2 PCB
60-2 wheel
triguer 67
a 10
a return 18
b 40
b return 48
lm1815n whit a standart shematic of the extra pages

i can read the RPM above 500rpm on fuelonly and stock ignition....
but on cranck, or low voltage i can´t read any RPM.....

any sugestion?

thanks

[jsmcortina]

Can you move the VR sensor closer to the 60-2 wheel?

Have you measured the VR sensor output with an AC voltmeter?

Are you sharing the VR sensor with the stock ECU? This may cause a problem.

James