I tried to install the Harlan Shift Light using MaximaDriver.com instructions. First of all, I did not see a "TAM" on the back of my gauge cluster. I used the green/yellow wire which feeds the signal to the RPM needle.
I was able to connect everything but here is the most wierd thing that happened.
With my shift light connected (tapped into the RPM wire) and it seems to stealing the signal. I set the shift light at 2500 rpms & it would turn on with a little rev, however, the factory tachometer would be DEAD.
If I disconnect the shift light wire, the the tachometer works just fine!! Of course I would want both the factory RPM & my shift light to work at the same time.

Any help would be appreciated.

 

you have a 99.
the TAM is not on the back of the 99 gauge clusters for some reason.

you need to tap into the ecu line. NOT the gauge line

 

I think xHypex tried that and it still seemed like the signal to the cluster was diverted, ie. tach dead.

Funny, I had one harlan working well off the TAM screw but when I connected the second, the tach would go dead. Either one alone worked fine.

I say go for one of the coil packs...

 

Coil Packs?!

 

How long did it take to get the shift light after you ordered it? I ordered mine two weeks ago and also sent Harlan an e-mail but have heard a thing....

 

Search and ye shall find.

At least I know I'm not the only one. You can either tap a coil, or you can wire in a resistor inline with the Harlan and it might work.
-hype

 

I'm not sure what you said means, but I did try splicing into the ECU tach wire & the SAME EXACT Thing. The factory tach is dead & now the car won't even start. I disconnected the shift light signal splice, and everything started working no problem.

After that incident, I really don't want to mess with the ECU. God forbid, but what is I had accidently cut some wire in there.

Any other options? Can you explan how this coil business would work?

Thanks,

 

Take off the plastic valve cover like you were going to change your spark plugs. On one of the coilpacks, pull back the wire covering and you should find 2 wires. 1 is black and the other will be with with a red stripe or something similar to that. Splice the white with red stripe wire. Its that easy