Plurco thanks alot for all your wireing infomation on your website...I did all the same things as you, even the LED, exept I got signal from the 6th Coil in the engine bay..Its worked every time since I finished it up

Now I have the Harlan set at 5000rpms but the light doesnt come on till about 5200 ?? I know its mecanical and it does take alittle bit to come on, but idk...maybe because its sweeping but 5000 fast ??
some help please

-matt

 

Maxima tachometers are not accurate. They register a couple of hundred rpm faster than actual.

 

Welcome to the club of bad tachs

http://forums.maxima.org/showthread....hreadid=241403

 

I would not worry about what the tach says, I would trust the signal the coil is sending to the harlan. It' probably a combination of the tach being slightly off and the VI needing a split second to activate.

 

Well it hits on 6800 but not on 6900 or 7000, so I hope your right on this one.

Even though the tach reads 7400 at time of cutoff, and when set at 5k it goes off at 5400 on the tach.

 

I made a shiftlight using an extra Harlan I had. Although the tach puts redline at 6500 rpm, the actual fuel cutoff is at 6400 rpm according to my dyno plot. I've seen this on other dynos, too. So I set the Harlan for 6300 rpm and the shiftlight came on exactly when the fuel cutoff kicked in. I had to set the Harlan to 6200 to keep from hitting fuel cutoff. I don't know if this indicates some inaccuracy in the Harlan or if there is enough lag in the shift light circuit (I'm using a relay) that I get a 100 rpm delay between when the Harlan triggers and my shiftlight comes on.