Lowandslow Posted November 18, 2013 Report Share Posted November 18, 2013 I installed a tach into my truck from a 4x4 but it is not coming on. I connected the connector behind the dash to the back of the tach but is that it?? Can I just run a signal wire to the back of the tach connector? The tach in my truck now. Ignition coil. The green wire coming off of it is the old signal wire for a sunpro tach. Random plug next to ign coil Quote Link to comment
datzenmike Posted November 18, 2013 Report Share Posted November 18, 2013 Can I just run a signal wire to the back of the tach connector? No. ... but it's an easy fix. Your wiring harness will or should have a plug taped up somewhere between the coils and the back of the driver's side headlights. It will resemble a lump all covered with electric tape. Uncover and fit this... Its a 2.2 K ohm resistor. All '80s Nissans with factory tachs will have it like the S110, S12 720, 280zx, 300zx. You can get a 2.2K ohm resistor from an electronics store and it will work also. Quote Link to comment
Lowandslow Posted November 18, 2013 Author Report Share Posted November 18, 2013 Is that connector on the second picture I posted of the coil? It goes to a small cylinder shaped thing and circles back around. Quote Link to comment
Lowandslow Posted November 18, 2013 Author Report Share Posted November 18, 2013 This is what I'm talking about Quote Link to comment
datzenmike Posted November 18, 2013 Report Share Posted November 18, 2013 For the '82 wiring harness it shows the plug over behind the battery on the other side. (sorry Z24 motors are by the coil) The wires are Black/Red and Black/Blue Quote Link to comment
Lowandslow Posted November 18, 2013 Author Report Share Posted November 18, 2013 I found it back by the firewall thanks!! I was stumped about this and all I could find was the newer style 720. So just get a resistor in there and it should work? Quote Link to comment
datzenmike Posted November 18, 2013 Report Share Posted November 18, 2013 Yup. You can find them on another 720s that has a tach or almost any '80s Nissan... with a tach in it. Someone recently asked about this and he bought a resistor and soldered it in. Bingo! Quote Link to comment
Lowandslow Posted November 19, 2013 Author Report Share Posted November 19, 2013 Awesome!! I got the part off the same truck that I got the dash and tach from. The only thing is it appears that I am missing the light for the tach so it is very dark. I got called into work so I will update you guys tomorrow on how the resistor works!! Quote Link to comment
datzenmike Posted November 19, 2013 Report Share Posted November 19, 2013 The tach fit's it's own pod in the instrument panel. If no tach the bulbs won't be there either. Just reach up behind another 720 dash and twist out a few lamps. Quote Link to comment
Lowandslow Posted November 19, 2013 Author Report Share Posted November 19, 2013 I have the dash from the 4x4 truck but it did not have any lightbulbs but it has a small round hole on the back where the connector goes.I get very little light from the coolant gauge on the tach Quote Link to comment
Lowandslow Posted November 21, 2013 Author Report Share Posted November 21, 2013 The tach is up and running!! Thanks datzenmike for all the help. The resistor I got frok the junkyard did not work so my friend soldered me up one! I got these at Radio Shack for 1.40 This is what the end product looks like. It was too dark and I had low battery so I could not take a picture of the working tach but ill upload it soon!! Thanks again!! 2 Quote Link to comment
datzenmike Posted November 21, 2013 Report Share Posted November 21, 2013 Alright! Cheap fix. Quote Link to comment
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