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HOWTO: Tachometer Repair (WAS:Tach is all caddywhompus)

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  #31  
Old 08-03-2014, 08:11 PM
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If you are shopping to buy a Tachometer look for the newer style that has an IC chip and less parts. There is not a cover over the back, It comes out of the cluster just as shown.
This was taken out of an 1986 F150.

.

Click the image to open in full size.
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1986 F150 XLT Lariat 4x4 300 C6, 9 inch 3:50, 235-15 tires, sway bars, DS2 w/ GM 4 pin and no computer; 3G ALT swap, PMGR starter; 120,000 miles, 2nd owner
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  #32  
Old 08-04-2014, 09:21 PM
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Interesting, I never seen that kinda of tach on these year of trucks. If possible what is the numbers that are on the IC chip? Its just out of focus to read it.
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  #33  
Old 08-05-2014, 01:06 PM
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Quote:
Originally Posted by Eddiec1564 View Post
Interesting, I never seen that kinda of tach on these year of trucks. If possible what is the numbers that are on the IC chip? Its just out of focus to read it.

LM1819 Air-Core Meter Driver
General Description Features
The LM1819 is a function generator driver for air-core
(moving-magnet) meter movements A Norton amplifier and
an NPN transistor are included on chip for signal condition-
ing as required Driver outputs are self-centering and devel-
op g 4 5V swing at 20 mA Better than 2% linearity is guar-
anteed over a full 305-degree operating range


Self-centering 20 mA outputs
12V operation
Norton amplifier
Function generator
Applications

Air-core meter driver
Tachometers
Ruggedized instruments
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  #34  
Old 01-05-2015, 01:31 PM
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Quote:
Originally Posted by Rogue_Wulff View Post
Yeppers. I solved Gary Lewis' tach reading too high in just a couple minutes time. His was a DS3 - DS2 conversion.
Near the DS2 box is a connector with 2 wires, 1 green, 1 black. The green wire goes to the coil, and the black wire goes to ground, but ONLY on a V8 truck. A factory 6 cyl truck will not have the black wire on the engine side of that plug.

As for the crud inside the tach causing erratic behaviour, these trucks are not the only ones that suffer from the issue. I need to disassemble the tach in my RX7 and clean it up. It works fine, till the temp drops to under 40F. I rarely remember about, since I rarely drive the car in temps cool enough to cause the tach to "wig out".......
Would you happen to know off hand where the ground wire from this plug attaches?
Thanks
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Old 01-05-2015, 05:33 PM
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Originally Posted by Ez2frag View Post
Would you happen to know off hand where the ground wire from this plug attaches?
Thanks
The end of this ground wire, the point where it touches metal, is in side the Dist Cap.

This wire is also the sole point of ground for the entire in IGN system. So if the engine runs ... the ground wire is good.

Not really sure if this answers your question or not.

Jim
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  #36  
Old 01-05-2015, 06:10 PM
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Thank you for your reply
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  #37  
Old 01-10-2015, 07:37 PM
Ez2frag Ez2frag is offline
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Did this to my tach last weekend - worked great - now reads like it should and doesn't change readings at will. Note instead of the the q-tips I used a very soft old worn out toothbrush and it seemed to work nicely. Thanks for this tip.
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Old 01-10-2015, 07:37 PM
 
 
 
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1979, 1994, 49, 73, coil, duraspark, erratic, f150, ford, ii, intermittent, pickup, reading, straight, tach, tachometer, taurus, tfi, wire

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