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Old 08-17-2007, 01:53 PM
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Radson Tach wiring help

I have a radson tach that I want to hook up to my 235 chevy. It didnt have any wires connected to it. on the inside it has 4 terminals and a wire that is not connected that goes to the bulb. Three of the terminals are marked. one is marked G, one 6 and one is marked 12 and the fourth is unmarked. I have tried to wire this a couple different ways with no luck. It is not grounded to the case so I cant trace the ground. I can trace to the two posts that go to the needle. Would one side of the needle be 12 volts and one ignition or one ground and one ignition? Any help would be great. I tried wiring this using the g as ground 12 as 12 volts and the unmarked as ignition. That didnt work.

Here's a pic

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Old 08-17-2007, 11:48 PM
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Doc here,

That looks like the head of a Two part Tach..Can't really tell without seeing more..

But without the amplifier box it makes a good pencil holder, and conversation piece..

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