dutchzcarguy Posted December 23, 2019 Share #13 Posted December 23, 2019 (edited) 2 hours ago, Captain Obvious said: so you don't bump it or catch it on something and pull more of the PCB trace off the board. Thats why i gave the advice to put the wire on the component side.. as pro's do.. (i've worked with studer revox machines, and ones opened up a TEAC... wow, there are a lot of those wires in there! A ReVox is well engineered.. they don't do/need that!) Edited December 23, 2019 by dutchzcarguy Link to comment Share on other sites More sharing options...
grannyknot Posted December 23, 2019 Author Share #14 Posted December 23, 2019 8 hours ago, Zed Head said: A service manual would have the diagram. It is an after market tach from I think 15-20 yrs ago and 510's didn't come with a tach unless it was special ordered. 9 hours ago, Captain Obvious said: Maybe. Can you post a pic of the other side of that tach board? I can probably tell you which ones are power and ground. Here you go, Link to comment Share on other sites More sharing options...
Captain Obvious Posted December 23, 2019 Share #15 Posted December 23, 2019 From those pics, I believe the black wire is ground side for power. Can you take the brass hex standoffs off and get a shot of the back side of the board? Is there enough slack in the tether wires connecting the board to the mechanical portion to spin the board over and get a straight on shot? Link to comment Share on other sites More sharing options...
Zed Head Posted December 23, 2019 Share #16 Posted December 23, 2019 3 hours ago, grannyknot said: It is an after market tach from I think 15-20 yrs ago and 510's didn't come with a tach unless it was special ordered. The wiring diagram from the car the dash came from would most likely match. Just saying. If it was in a car then the diagram is out there. Link to comment Share on other sites More sharing options...
grannyknot Posted December 23, 2019 Author Share #17 Posted December 23, 2019 Link to comment Share on other sites More sharing options...
Captain Obvious Posted December 24, 2019 Share #18 Posted December 24, 2019 Red is +12. Black is ground. Green is speed input.* White is gauge illumination lamps. *Note that I don't know what kind of signal the tach is expecting, but the green wire is where it should occur. 1 1 Link to comment Share on other sites More sharing options...
Captain Obvious Posted December 24, 2019 Share #19 Posted December 24, 2019 (edited) And... The smaller red and black wires leading deeper into the tach are what makes the gauge needle move. I can tell you more about that if there are problems, but I'm hoping it just works and we don't have to. Edited December 24, 2019 by Captain Obvious better choice of words. Reduce the obfuscation. 1 Link to comment Share on other sites More sharing options...
grannyknot Posted December 24, 2019 Author Share #20 Posted December 24, 2019 Thanks Bruce, that is a big help. Link to comment Share on other sites More sharing options...
Captain Obvious Posted December 25, 2019 Share #21 Posted December 25, 2019 Glad to help. Hope the project goes smooth. Link to comment Share on other sites More sharing options...
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