hey guy's, i have an autometer sport comp tacho in my dash running from the tach port of a msd 6al. when it hits around 2000rpm the needle starts fluxuating randomly all over the place, sometimes varying eather way by up to 500rpm. if i hit 4000 it's going absolutley rank. i was told i might need a potentiometer in the line??? any ideas or exactly what i need???
cheers.
tach help
Started by
_Bomber Watson_
, Dec 09 2005 08:40 PM
11 replies to this topic
#2
_Torana482HP_
_Torana482HP_
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Posted 09 December 2005 - 09:23 PM
Not sure, sounds like theres a problem with your tacho, but you could try the potentiometer option - dunno how to hook it up though - and it says in the instructions that you shouldnt need a tach adapter for autometer guages so im stumped on this one.
Regards Anthony.
Regards Anthony.
#3
_Bomber Watson_
_Bomber Watson_
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Posted 09 December 2005 - 09:33 PM
yes i know. has me a bit curious as well. i had a vdo tach in there and it was doing the same thing, put in the autometer one thinking it would solve the problem but no luck.
oh, and before anyone asks, yes it is earthed properly.
oh, and before anyone asks, yes it is earthed properly.
#4
_jap-xu1_
_jap-xu1_
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Posted 09 December 2005 - 10:30 PM
are you using the tach output wire from the msd?
#5
_Bomber Watson_
_Bomber Watson_
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Posted 09 December 2005 - 10:38 PM
hey guy's, i have an autometer sport comp tacho in my dash running from the tach port of a msd 6al.
#6
_jap-xu1_
_jap-xu1_
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Posted 09 December 2005 - 10:52 PM
now where did i put my rock? lol sorry dude
ok here i go again. is the tach in 6 cly mode?
ok here i go again. is the tach in 6 cly mode?
#7
_jap-xu1_
_jap-xu1_
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#8
_Torana482HP_
_Torana482HP_
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Posted 09 December 2005 - 11:22 PM
Yeah thats weird, im just using my original torana tacho connected to the tach port on the msd and it works fine. as i said, its got me stuffed, although msd have a tech forum so you could get onto their website and ask the msd tech department what they think the problem might be.
Regards Anthony.
Regards Anthony.
#9
_Bomber Watson_
_Bomber Watson_
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Posted 10 December 2005 - 12:38 AM
yep.is the tach in 6 cly mode?
ok, ta for the help. i'll get onto the tech guy's...i might pull the dash out tomorow and see if i can find something scetchy...the whole lots double earthed but you never know.
#10
ToRunYa
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No Longer A Contributing Ninja/Member.
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Posted 10 December 2005 - 07:09 AM
allergic to rice?
thank god it aint sittin on top of the dash
thank god it aint sittin on top of the dash
#11
_devilsadvocate_
_devilsadvocate_
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Posted 10 December 2005 - 08:03 AM
Normally wouldnt visit the "interior section", but saw the "tach help" as last post.
Site designers/moderators:
a separate electrical section would be good.............
Lcboi, saw your post on the msd forum. Dont know if their reply is terrible helpful, there explanation being that the fluctuations you see are from variations in voltage supply to the msd ignition and/or your tacho. Unless you have just twisted wires together, or your voltage reg on your alternator varies widely, than I doubt that this is the prob
This should be easy enough for you to verify with a digital multimeter, checking your voltages at all the connectors at different rpm.
There is mention of a tacho adapter, but no other details on the site.
Perhaps when you post again with them, mention the brand/model of the tacho or that it is a tacho for a simple points system etc.: its an American site - a Holden torana will not mean anything to them. or to get their interest its a GM car designed for australia.
Re potentiometer, you could purchase a 0-10K potentiometer( a couple of $) and put that in wire from the msd controller to the tacho, and vary the resistance and see it has any +ve effect - dont think it would do anything - but it wont cause any damage and is cheap to try.
Site designers/moderators:
a separate electrical section would be good.............
Lcboi, saw your post on the msd forum. Dont know if their reply is terrible helpful, there explanation being that the fluctuations you see are from variations in voltage supply to the msd ignition and/or your tacho. Unless you have just twisted wires together, or your voltage reg on your alternator varies widely, than I doubt that this is the prob
This should be easy enough for you to verify with a digital multimeter, checking your voltages at all the connectors at different rpm.
There is mention of a tacho adapter, but no other details on the site.
Perhaps when you post again with them, mention the brand/model of the tacho or that it is a tacho for a simple points system etc.: its an American site - a Holden torana will not mean anything to them. or to get their interest its a GM car designed for australia.
Re potentiometer, you could purchase a 0-10K potentiometer( a couple of $) and put that in wire from the msd controller to the tacho, and vary the resistance and see it has any +ve effect - dont think it would do anything - but it wont cause any damage and is cheap to try.
Edited by devilsadvocate, 10 December 2005 - 08:07 AM.
#12
_Bomber Watson_
_Bomber Watson_
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Posted 11 December 2005 - 08:52 PM
actualy it sits like this:allergic to rice?
thank god it aint sittin on top of the dash
if thats rice officialy brand me a ricer...
devilsadvocate:
thanks for that mate. the reply on the msd forum wasn't to bad, specialy the seperate earth and isolate the mag pickup wires tips. i'll try there ideas first up, and if i have trouble i'll go on and give more info. your tips are good, i'll have a look at them to.
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