Tachometer Woes
Thread Starter
Heel & Toe
Joined: Nov 2006
Posts: 15
Likes: 0
From: Defiance Mo
Tachometer Woes
Last night my 77 tach jumped to 3K and stays there. When the engine is shut off it sometimesdrops back to 0 but when started again, goes to 3000 or 3500.
What Gives? Is this something I can tackle?
Jon
What Gives? Is this something I can tackle?
Jon
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
If you can get the wires off the tach, check the tach wires. Usually when a tach stops and holds a reading it is without power or the board is failing.
The tach has three wires running to it, power, ground and signal. When you turn off the car it will usually hold the last reading until you power it up again by turning on the key. This is why I’m suggesting you check the power and ground wires.
When you turn on the key, the tach should have power and a verified ground. With the key in the ON position, the tach should go to zero and is waiting for signal.
If you have power and ground then I would have to say you are in need of a board.
Let me know and post again.
Willcox Inc.
Not for your car, but works on the same set of rules.
The tach has three wires running to it, power, ground and signal. When you turn off the car it will usually hold the last reading until you power it up again by turning on the key. This is why I’m suggesting you check the power and ground wires.
When you turn on the key, the tach should have power and a verified ground. With the key in the ON position, the tach should go to zero and is waiting for signal.
If you have power and ground then I would have to say you are in need of a board.
Let me know and post again.
Willcox Inc.
Not for your car, but works on the same set of rules.
Last edited by Willcox Corvette; May 30, 2009 at 09:38 PM.
Thread Starter
Heel & Toe
Joined: Nov 2006
Posts: 15
Likes: 0
From: Defiance Mo
Tach
Thanks for the info. I hope to be tearing into it tomorrow.
Your place is in Jeffersonville....?
Know it well. A friend of mine in Jeffersonville, Doug Kiesler, had a collection of restored WWII Tanks that we used to work on and run all over the midwest.
I still do the tank thing in Shepardsville, Ky with a bunch of local hot rod guys.
I will be down that way this week and will look your place up.
Thanks again,
Jon
Your place is in Jeffersonville....?
Know it well. A friend of mine in Jeffersonville, Doug Kiesler, had a collection of restored WWII Tanks that we used to work on and run all over the midwest.
I still do the tank thing in Shepardsville, Ky with a bunch of local hot rod guys.
I will be down that way this week and will look your place up.
Thanks again,
Jon
