hi everyone,i came across a 8 grand adjustable redline tach made by stewart warner.this thing appears to be late 60's early 70's.i took the back off and traced the wires:it has two black,one red wire and one green wire.the two black lead to the bulb,but i am lost on the red wire and the green wire.can anyone help?on the face it says:stewart warner 827909 made in usa.perhaps i could send someone a picture and they could post it on this sight?,(still learning on the camera)and maybe identify the year.thanks in advance for any help,advice,and input.drive safe chuck.
The red connects to a "key on" positive source. The Green connects to the negative side of the ignition coil.
Some of those old tachs weren't switchable between using on a 6 cyl. and a 8cyl. like modern tachs are now. If that's the case and it's for a v8 it won't read correctly on your 6 cyl.
Careful... ... Some tachs, Sun and Stewart Warner require a transmitter to work. And yes the previous post is correct re: number of cylinders. On the Sun tachs the transmitter was different depending on # of cylinders. I am not sure about Stewart Warner transmitters. Do a websearch and find some info on Stewart Warner Vintage tachs. Or, call some of the repair shops for vintage gauges and describe and give your serial/model # to them. They can tell you exactly what you need. I have several vintage tachs. They do not all hook up as stated in the previous post. Seth
