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AMX 390 HEI tach wiring |
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Hammertime 
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Joined: May/19/2014 Location: Oregon Status: Offline Points: 55 |
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 Topic: AMX 390 HEI tach wiringPosted: Jun/18/2019 at 10:41pm |
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I am replacing a Mallory Unilight electronic distributer on my AMX. The PO had it on here but it was noting but a problem to keep working. I have an HEI I want to replace it with but I am stumped on how to wire it so the tach will work. The only wire I had comming into the coil was a yellow wire. No other wire that I can find. The yellow wire appears to have been the hot side for the coil. The tach worked great, but how? There does not appear to be any lead to connect the tach side of the HEI to operate the Tach in the dash. I searched this forum for some type of diagram with no luck. Does anyone have experience with this?
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1969 AMX
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mixed up
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Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2178 |
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Posted: Jun/18/2019 at 11:25pm |
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there should be a spade connection on the hei in the little square part marked tach look inside there
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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Hammertime
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Joined: May/19/2014 Location: Oregon Status: Offline Points: 55 |
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Posted: Jun/19/2019 at 1:07am |
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I understand the tach connection on the distributor, but there is only the one yellow wire that went to the coil. If I use that to power the positive side of the distributor what do I use for the tach connection?
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1969 AMX
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304-dude
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Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Posted: Jun/19/2019 at 4:39am |
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Most HEI distributors dont have the tach pigtail as part of the purchase.
You may have to locate the wire connector and a tach filter for use with factory a tach. This is the generic version of the signal filter... https://www.classicparts.com/1947-72-Tachometer-Filter/productinfo/24-736/ This is the tach connector... https://www.amazon.com/Xislet-Distributor-Tachometer-Pigtails-Connector/dp/B079Q5JGZ2/ref=asc_df_B079Q5JGZ2/?tag=bingshoppinga-20&linkCode=df0&hvadid={creative}&hvpos={adposition}&hvnetw=o&hvrand={random}&hvpone=&hvptwo=&hvqmt=e&hvdev=m&hvdvcmdl={devicemodel}&hvlocint=&hvlocphy=&hvtargid=pla-4584276296690020&psc=1 |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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AMXrated
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Joined: Jul/26/2015 Location: Indiana Status: Offline Points: 290 |
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Posted: Jun/19/2019 at 7:39am |
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FYI.
I used the classicparts.com 47-72 filter and my factory tach is still about 500 rpm higher than my newer Bosch Tach. I never tried my factory tach without the filter so not sure if one of them are just off or the filter is not "filtering"...
Someone on the forum also suggested this filter, but I had read that the earlier version would work better: I plan to take the filter off and see if it makes a difference on my factory tach. If I'm really 500 rpm off with the filter, I may try the GM version above to see if it makes any difference.
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You can have my Hurst shifter when you pry it from my cold dead hand.
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Hammertime
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Joined: May/19/2014 Location: Oregon Status: Offline Points: 55 |
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Posted: Jun/19/2019 at 9:58am |
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I have the classic parts tach filter and a pigtail. When wiring them I am questioning if I run the yellow to the tach pigtail on the HEI and utilize a relay for the hot to the HEI using the ignition on to trigger the relay if this may work. My big fear is doing something that could destroy the Tach
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1969 AMX
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6PakBee
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Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5458 |
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Posted: Jun/19/2019 at 10:21am |
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This may be of some help. http://theamcforum.com/forum/hei-ignition-and-factory-tachometers_topic46458.html
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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Hammertime
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Joined: May/19/2014 Location: Oregon Status: Offline Points: 55 |
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Posted: Jun/19/2019 at 10:38am |
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I can not get that link to open. Also searched the title and it does not show on the search.
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1969 AMX
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304-dude
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Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Posted: Jun/19/2019 at 11:02am |
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I think the paste function got messed up before the reply had completed.
Here is a fixed link, that works. http://theamcforum.com/forum/hei-ignition-and-factory-tachometers_topic46458.html |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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Hammertime
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Joined: May/19/2014 Location: Oregon Status: Offline Points: 55 |
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Posted: Jun/19/2019 at 11:14am |
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Great that link worked good. I am going to experiment with this a bit this week and see what I can figure out.
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1969 AMX
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