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Electrical Questions and Answers This is the place to ask all your question about electrical problems and instalation issues.

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Old 09-13-2017, 10:16 PM   #1
56er_Fan
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Default Sun Tach / Transmitter question

I have a Sun Tach w/Transmitter that appears to be in perfect working condition. This came with my car but, I plan to use a newer model.

Anyone able to tell me what it's worth and approximate age?
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Old 09-13-2017, 10:43 PM   #2
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It is probably very late 50's or early 60's. It is not a 1962 409 tach. I wouldn't think it is worth much more than $50.00. But.... I have been wrong before.
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Old 09-13-2017, 10:50 PM   #3
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Quote:
Originally Posted by 56er_Fan View Post
I have a Sun Tach w/Transmitter that appears to be in perfect working condition. This came with my car but, I plan to use a newer model.

Anyone able to tell me what it's worth and approximate age?
Have you ever had it hooked up? Those EB9A transmitters have 2 discontinued batteries inside and many of them end up all corroded inside. They are mercury batteries and are rated at 1.35 volts each. You can use 1.5 AA batteries but the tach will read about 10% high.
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Old 09-13-2017, 10:57 PM   #4
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Bruce is not kidding. They used a Mercury battery that has been discontinued for many years and there is no real good substitute. When those batteries corrode, it's a dangerous Mercury corrosion. The early versions of the EB transmitters had the power wires soldered to the batteries. Later versions used battery holders. Look on the back, the red date coding may still be visible. The tach has been painted black.

The transmitter can be modified to run the tach with no batteries.

http://www.tachman.com/sun.htm
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Old 09-14-2017, 08:08 AM   #5
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8 cyl transmitters are more valuable than the 4 / 6 cyl units.

8K tachs = a few more $$.

Open the transmitter if all corroded inside its worth less.

If it works its worth 2 bills minimum. A working 8 cyl Sun is a rare bird.

Should be able to remove the paint on the head with #0000 steel wool.
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Old 09-14-2017, 12:39 PM   #6
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Hmmm...."no good substitute", maybe for some, but not what I have found. For many decades, I have used a 12 volt DC input to adjustable DC voltage output power feed that I used to get from Radio Shack to power up those boxes. These items are still available on places such as eBay and other good electrical outlets.

Also, a set output supply, with the correct resistor can also be used effectively.

When adjusted to the correct voltage output, the tach works as designed, and, there are NO batteries, the whole thing runs of switched voltage in the car.

I'll leave it to all of you to figure it out for yourselves from here.

Willard Thompson.
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Old 09-14-2017, 09:24 PM   #7
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Quote:
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8 cyl transmitters are more valuable than the 4 / 6 cyl units.

8K tachs = a few more $$.

Open the transmitter if all corroded inside its worth less.

If it works its worth 2 bills minimum. A working 8 cyl Sun is a rare bird.

Should be able to remove the paint on the head with #0000 steel wool.
I'm going to assume the transmitter is corroded. There were spots on the gasket that look like it may have had some corrosion when I cleaned up the outside. Not a lot but, enough I don't want mess with opening it up. I've read that mercury corrosion can be nasty so I'd just rather not mess with it. I'm probably just going to dispose of it and hold onto the tach. Maybe I'm being too paranoid? At least now I know what it is and thank everyone for the input.
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Old 09-15-2017, 12:04 AM   #8
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Newspaper, nitrle gloves, give it a go and see what it looks like.

Yes, no good substitutes for the Mercury battery, with the exception of converting the whole mess to no batteries. The Mercury batteries were used because they would hold a more or less stable voltage right up to the point they were fully depleted. Modern batteries cannot do that.
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