Viper 5901 - won't learn tach
 

Anyone successfully learned the tach with a Viper 5901 or equivilant? Which wire did you use?

I'm using coil #1 signal off the ECU and the darned thing won't learn it.

I also tried flipping the jumper on the back of the alarm brain according to the docs (required for some vehicles) but it still won't learn it.

So I'm stuck using virtual tach (voltage sense) which works OK for regular old remote start but doesn't allow valet take over or turbo timer operation.

Thanks in advance.

I would use a fuel injector, not a coil. It's duty cycle is much higher making it an easier signal to read.

you should go under the hood and use one right from a coil...i used one from there and learned no problem

I'll try an injector wire instead. When I finally get everything working right I'll post a write up.

Cheers

You can grab it right at the ECU under the passenger dash - no need to go under the hood.