2002 Nissan Sentra Tach problem

Ok, so I went to the coils (the top of the 1.8 engine) and used the wires supplied in the Directed wiring guide, and I can get a signal of 30.1 or 30.5 when the engine is running with my multimeter set to AC voltage.

Then when i rev the engine it doesn't go up at all. I then went to a fuel injector, and probed both the wires and got the same results with one of the wires. I get around 30.0 but when i rev the engine it stays at 30 doesnt go up.

The injectors are just above the "nissan" sign and the coil packs should be just below the "nissan" sign correct? When I hook into the wire with the DMM and turn it to 200 AC, the voltmeter says 0.00 when the vehicle is off, when I start the vehicle up it goes to about 30.0 but doesn't go up with higher rpm's. Any help appreciated.

Ok guys still having problems with the Tach. Basically I got the unit to accept the tach signal, but now the remote start won't start because it says " Tach or vacuume line detected while attempting to start"

I checked the AC voltage on the tach wire, with the vehicle off and at the 200 setting it detects about 5. When the vehicle is running it is much higher.

I am using the first injector (far left if your facing the engine).