viper 5901 where is tach jumper?

The uncommon wire at the coil is reading .3v so I'm trying to lower the tach voltage threshold like the directions suggest. It tells me to move the jumper from the default position to the other side. Where is the tach jumper? The only jumpers on the outside are to tell the 5901 that you have docked a bypass in the bay. They jumper horizontal if using an external bypass, and horizontal if a bypass is docked. Under the cover is the light flash polarity fuse to be jumped, but that's not it. Can't find any other jumpers!

Nextto the Bitwriter port?

3vAC is perfectly OK

And I think what you're looking for is in the programming rather than change anything physically.

its programming for sure. No need to lower tach threshold. Low tach is < 1.3 volts anything thing above and the unit should detect.

Go through tach programming again

Ted

2nd Year Tier 1 Medical School

Still installing as a hobby...pays for groceries

Compustar Expert