z or bust Posted June 17, 2008 Share Posted June 17, 2008 Yeah bro!! lol. I had to read it a few times to understand but I know what you're talking about. And here's plain english for the guy that asked if he could use his 72 tach like three times.. What Z-ya is trying to say is 73 and up = bueno 70-72 no bueno. Do ya get it now?? Quote Link to comment Share on other sites More sharing options...
Raami Posted June 17, 2008 Share Posted June 17, 2008 Yeah bro!! lol. I had to read it a few times to understand but I know what you're talking about. And here's plain english for the guy that asked if he could use his 72 tach like three times.. What Z-ya is trying to say is 73 and up = bueno 70-72 no bueno. Do ya get it now?? If you really don't have anything to say about getting the tach work, so why are you writing?? I haven't asked three times or have I?? Quote Link to comment Share on other sites More sharing options...
Six_Shooter Posted June 18, 2008 Share Posted June 18, 2008 Correction: You will need a '74 to '78 tach. The '73 is still a current sensing tach. How do I know this? MY '73 had a current sensing tach, and all information I've read confirms this. A '74 260 tach has the same font as the earlier 240 tach, but is voltage (points) sensing. I have one of these that I'd be willing to part with. It will be in a 280 enclosure, since I used part of the 260 enclosure for my gauge conversion. The only difference between the 260 and 280 tach enclosure is the 4 screws that hold the face (black plastic) to the metal rear casing. Quote Link to comment Share on other sites More sharing options...
Raami Posted June 18, 2008 Share Posted June 18, 2008 Correction: You will need a '74 to '78 tach. The '73 is still a current sensing tach. How do I know this? MY '73 had a current sensing tach, and all information I've read confirms this. My previous car, which was 240z -73 also had current sensing tach so you are right on that. Quote Link to comment Share on other sites More sharing options...
z-ya Posted June 18, 2008 Share Posted June 18, 2008 I've seen late 73s that had the voltage tach. Pete Quote Link to comment Share on other sites More sharing options...
Raami Posted June 19, 2008 Share Posted June 19, 2008 My stock tach works now. I just wired that original black/white wire to the coil pack +12v without the resistor. So that power to the coil pack goes through the loop in tach. So simple that I didn't even think it could work. Quote Link to comment Share on other sites More sharing options...
z-ya Posted June 19, 2008 Share Posted June 19, 2008 Glad to hear it works! My initial concern was that you are now powering three coils through a tach that originally powered only one stock one. Since they are not firing at the same time, this should not be a problem. But, your modern wasted spark coils do use more power. Again, I don't think it will be a problem because I know many people that run hot coils through the stock tach. Pete Quote Link to comment Share on other sites More sharing options...
Raami Posted June 19, 2008 Share Posted June 19, 2008 Glad to hear it works! My initial concern was that you are now powering three coils through a tach that originally powered only one stock one. Since they are not firing at the same time, this should not be a problem. But, your modern wasted spark coils do use more power. Again, I don't think it will be a problem because I know many people that run hot coils through the stock tach. Pete It seems to work very well even on high revs and on boost so I think it's ok. I only have to calibrate the tach a little when I compared the tach reading and MS reading. Quote Link to comment Share on other sites More sharing options...
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