SubwayGUY4 Posted December 17, 2009 Report Share Posted December 17, 2009 (edited) Alright so I got bored and wired this phantom tach that I had sitting around black ground green to - on the ignition coil and red to my battery............ oh and if it matters white? to the - side as well. the white wire just made the guage luminate.....so yeah i dont know if that matters. weird thing is it is just jumping around and or always zero but when i turn my headlights on it is completely steady and seems more accurate. so.......thus what should i move. thanks oh this is in a 510 Edited December 17, 2009 by SubwayGUY4 Quote Link to comment
zerow Posted December 17, 2009 Report Share Posted December 17, 2009 (edited) Alright so I got bored and wired this phantom tach that I had sitting around black ground green to - on the ignition coil and red to my battery............ oh and if it matters white? to the - side as well. the white wire just made the guage luminate.....so yeah i dont know if that matters. weird thing is it is just jumping around and or always zero but when i turn my headlights on it is completely steady and seems more accurate. so.......thus what should i move. thanks oh this is in a 510 Is the case metal? I had something similar with an old toyota corona I used to have. The wiring had a ground wire, and it went bumping along (never checked with headlights...) until i had bumped my hand (while holding the metal case of the tach) and touched the metal around the dash cluster. ZAP! and the tach was right on the money. Grounded the case and connected the ground wire and was good to go. However... I think you have some of the wiring different. Usually the green wire in most Datsuns is for + illumination, which may explain why the tach works well with the lights on, it is receiving the current from the battery instead of the from the coil. Perhaps a swap of the wires may do the trick. Definitely black for Ground. Check. Next, check to see which of the pairs (Green and White or Red and White) give illumination and connect the other wire to the coil. Good Luck! Edited December 17, 2009 by zerow Quote Link to comment
SubwayGUY4 Posted December 18, 2009 Author Report Share Posted December 18, 2009 well i moved the white to the + side I tried green on + but it didnt work. Maybe the coil plate thing with the + and - is just reversed.....idk It still jumps around and isnt to steady but its completely steady when im driving so i guess i'll deal. Quote Link to comment
Unclejesse88 Posted December 18, 2009 Report Share Posted December 18, 2009 If this phantom tach is an aftermarket unit like I think it is, then everything should be correct. Black to ground, red to switched b+, and green to coil negative. White should go to a wire that is hot when the lights are turned on. The only other thing I can think of is some of these tachs require adjustment depending upon how many cylinders you have it hooked to. Some require you to cut a wire in the back of the tach, and some have dip switches Quote Link to comment
SubwayGUY4 Posted December 18, 2009 Author Report Share Posted December 18, 2009 whats red to B+? and yeah there were about 3 cut wires on the back. those 4 wires were all that werent cut. Quote Link to comment
zerow Posted December 18, 2009 Report Share Posted December 18, 2009 whats red to B+? and yeah there were about 3 cut wires on the back. those 4 wires were all that werent cut. Send a picture of it, front and back. We can then determine "phantom" status (id it for you...) and we can see what all has been hacked on the back (what is important, and how to hook it up...) Quote Link to comment
Unclejesse88 Posted December 19, 2009 Report Share Posted December 19, 2009 B+ is battery. So red needs to go to battery, or better yet a switched with ignition source. It's been a while since I installed a tach, but I don't remember cutting all three wires on the back. Maybe do a google search for your tach and see if you can find the install instructions that say which of those wires need to be cut Quote Link to comment
bonvo Posted April 30, 2010 Report Share Posted April 30, 2010 only thing that is off is the light (white) that should be run to the headlight swith shoot me a text tomorrow and i may be able to swing by and have a look Quote Link to comment
Datsfrodo Posted July 31, 2010 Report Share Posted July 31, 2010 Had some free time today and felt i should wire my tach. As goes Sunpro super tach 2 1) Red wire = 12v 2) Black wire = ground 3) White wire = 12v from any light source. 4) Green wire = Coil neg He is the Tricky part the coil neg is not black, its a LIME GREEN. and he it is done, no issues. Quote Link to comment
Datsfrodo Posted July 31, 2010 Report Share Posted July 31, 2010 Somethings wont let me download pictures.... not sure if its photobucket or my comp. Any way the connector is the one on the left of the coil wire, Has a Green/blk wire and a black. Use the geen one for the coil ground you should have no issues Quote Link to comment
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