OMC V4 115 Crossflow adding Faria tach answered

[narmstrong26]

Hey all I was looking around the forums for how to add a Faria tach to my 115 V4 without any luck. The instructions from Faria just say you may need a voltage regulator kit. No one that sells the tach has ever heard of it and Faria isn't much help either. After mucking around a bit I figured it out. For most V4 Cross flows 115 (I don't know about the 90 but I would assume the same). You need to connect the signal post to the Grey wire leaving the regulator. The battery feed to the purple wire (or a switched source) and the ground to ground of course. Set the pole setting on the back of the tach to 5. On my engine a 97 there is a terminal strip on the left side of the engine that has the gray wire about 4th wire down and the purple wire at the bottom. I have heard on older engines you may have to dig the gray wire out of the harness and tap into it. That should be it wired up and going.

 

[emdsapmgr]

Re: OMC V4 115 Crossflow adding Faria tach answered

Your control box should have a tach signal wire inside left there by the factory. You will find a grey wire cut off inside the box. You can pull the end of it through a small hole between the two box halves and connect it to the signal terminal on the tach. Now all you need it a ground and hot. You should set the tach at 6 for this engine to read the pulses correctly.

 

[narmstrong26]

Re: OMC V4 115 Crossflow adding Faria tach answered

Thats odd because on my Tach it wouldn't read on the 6 setting. I verified the reading for the 5 setting with my dwell meter as correct. Maybe my tach is off? Anyway thats what worked for me.