Farm Equipment - Electronic Tachometer Implementation

Print Page | Close Window

Electronic Tachometer Implementation

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=203307
Printed Date: 20 Sep 2024 at 9:34pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Electronic Tachometer Implementation

Posted By: calico190xt68
Subject: Electronic Tachometer Implementation
Date Posted: 20 Sep 2024 at 5:00pm

Again, this is off Allis topic but I do use this semi as "farm equipment". I can't resist asking because the electrical help is phenomenal on the forum! The GMC General semi that I just fixed the burnt wire on has no mechanical tachometer cable. I believe it is missing due to the Cummins engine replacement. The tach cable may not have matched the tach in the dash. Just wondering if it would be possible to install a new Electronic Tachometer that uses the alternator? I believe I have the 12000 LC series Leece/Neville alternator but they do have multiple models and not sure which one I have. Would this alternator work with an Electronic Tachometer? The other option is to purchase a mechanical cable and replace the tach in the dash that fits that cable. I would really like a working tachometer on this truck. I don't care about the odometer. To bring this topic back to tractors though, could you also implement an electronic tach on a tractor if you really wanted to do that? Thanks for any and all electrical advice!

-------------
80 7010, 80 7020. 67 190XTD Series I w/500 Loader, AC 2000 Plow, AC 4 row Planter, AC 77G Rake, Member Indiana A-C Partners, Member TAC

Replies:

Posted By: jaybmiller
Date Posted: 20 Sep 2024 at 5:02pm

Alternators designed for tachs will have a 'special' terminal or tab.

That info 'should' be in the spec sheet......

-------------
3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water

Posted By: PaulB
Date Posted: 20 Sep 2024 at 5:30pm

If the tachometer in the dash is a mechanical unit and the rotation is the same, just get a drive cable made to go from the tach drive on the engine to the dash.

For an electric tach get mechanical sender that goes where you would connect a drive cable.

-------------
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY

Posted By: steve(ill)
Date Posted: 20 Sep 2024 at 7:15pm

and on a tractor.... diesels engines normally use the pickup stud on the alternator... gas engines can use the PULSE from one spark plug...... and it is always possible to mount s SPEED PICKUP sensor on a bracket near the crank shaft pulley and use a magnetic strip on the pulley, or a set screw, or a hole, etc... anything you can COUNT per revolution.

-------------
Like them all, but love the "B"s.

Posted By: 8070nc
Date Posted: 20 Sep 2024 at 8:34pm

It is possible to put to get a tach and pickup. Speedhut has everything you need on thier website. You can have the tach made with different background colors and even a logo. I just had one made for my L3 gleaner. Its possible that the sae belhouing has a hole drilled and tapped for the pickup

-------------
1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor