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73 Road Runner Tach Problem #68531
06/06/08 08:03 AM
06/06/08 08:03 AM
Joined: Aug 2006
Posts: 153
Missouri
70X Offline OP
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70X  Offline OP
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Joined: Aug 2006
Posts: 153
Missouri
Just bought a used tach for my 73 RR. Works, but will not go back down to zero after being shut off, stays around 1500 - 2000. I took it back out and when you move it by hand sometimes it will go back down to 0, but most of the time the needle gets hung up. Is very easy to manually push it back to 0. Any help would be appreciated.

Re: 73 Road Runner Tach Problem [Re: 70X] #68532
06/06/08 10:33 AM
06/06/08 10:33 AM
Joined: Aug 2007
Posts: 6,089
Valencia, España
NachoRT74 Offline
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NachoRT74  Offline
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Valencia, España
if is autometer, they keep on last RPM reading when turn it off, dunno other brands.

have you tried get back ign switch to ACC position ( if you are power it from ACC source ) once you shut off the engine, to check if gets 0 by itself ?


With a Charger born in Chrysler assembly plant in Valencia, Venezuela
Re: 73 Road Runner Tach Problem [Re: NachoRT74] #68533
06/06/08 01:26 PM
06/06/08 01:26 PM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
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DaytonaTurbo  Offline
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Manitoba, Canada
Yeah, OEM tachs in a couple of my 80's mopars always were like that. When you shut it off, the needle stays at it's previos reading, however once you apply power to it again, it goes back to zero until you start the engine. Just the way some tachs work.

Re: 73 Road Runner Tach Problem [Re: DaytonaTurbo] #68534
06/06/08 04:28 PM
06/06/08 04:28 PM
Joined: Aug 2006
Posts: 153
Missouri
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Missouri
Thanks Guys,

It is a factory tach that I am having problems with.







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