If you converted to a 260Z/280Z tachometer,
1. Did you also put a resistor in the circuit?
2 Is the tach signal wire hooked up to coil negative?
1. Did you also put a resistor in the circuit?
2 Is the tach signal wire hooked up to coil negative?
73 tach problems
Tach works intermittently when in the dash. I removed it and ran wires straight from a good ground, straight from the positive battery terminal and straight to the negative terminal on the coil. ( I have the later style tach with the 3 post connector.) The tach works in this configuration but reads approximately 1K rpm high. When I remove the coil wire from the tach it still reads 1K rpm, but it is still connected to the battery. I had the tach internals checked and everything is ok. I think that there may be a bad power wire or a bad ground wire. Why would the tach continually read 1K rpm with no input from the coil? I have a Pertronix 0.6 ohm Flamethrower II ignition coil matched to an Ignitor II electronic ignition unit. Have removed the ballast resistor and added the loop wire so the car starts properly.
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I did not convert to a 260Z tach, but it is a late 7/73 tach with the 3 wire connector.If you converted to a 260Z/280Z tachometer,
1. Did you also put a resistor in the circuit?
2 Is the tach signal wire hooked up to coil negative?
Yes the signal wire is hooked to the coil neg.
It's a Pertronix ignitor II system, which calls for removing the resistor and uses a 0.6 ohm coil.
I did not say ballast resistor. The 3 wire tachometer needs a resistor, 2.2k Ohm 1/4 watt, in between the tachometer and the negative of the coil.I did not convert to a 260Z tach, but it is a late 7/73 tach with the 3 wire connector.
Yes the signal wire is hooked to the coil neg.
It's a Pertronix ignitor II system, which calls for removing the resistor and uses a 0.6 ohm coil.
Thanks Steve, I will install the resistor.
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