hi..i have a 95 5speed gxe... my tach wont work anymore so i bought a new tach. The new tach only has 4 cables, which are back, red, green, and white, but the tach from the cluster has a lot more i tried to connect to almost all of them, but the new tach still not working.... can someone please help install this tach thank you

 

An after market's tach's 4 wires are:

Red: Power
Black: Ground
Yellow (possibly some other color): Illumination
Green: Signal

The signal wire is normally tapped into at the distributor or the low voltage side of the coil. The tach then electronically counts the number of pulses and divides the pulses by the number of cylinders and multiplies it by two to get one signal per revolution of the crankshaft. Many tachs will have a switch that allows it to be used with 4, 6, or 8 cylinder engines. If you don't, then you need to buy one for specifically a 6-cylinder engine. I'm not sure as to where you're supposed to tap off to in the Maxima. If I have to install it, I'd suggest tapping off each low voltage side of each of the coil packs. This will get you your six signals. However, you don't want to fire all the coils at the same time, so you'd need to use diodes to keep the signals from interfering with each other since there is only a single signal wire to the tach. See the picture below.