What Is It??????

handtools · Feb 18, 2018

coolreinfarm said:
It’s a AC Delco rpm test gauge for auto mechanics

I vote for this :twocents:

kirkawilson · Feb 18, 2018

Here is one on 'fleabay'.Vintage AC Delco RPM Handheld Tachometer Gauge HT1 1536486 | eBay

sd455dan · Feb 18, 2018

ovrszd said:
Here's a couple pics to give you size relevance.

View attachment 540524

View attachment 540525

View attachment 540526

I have 1 of those made by a different manufacturer - it displays on the the top though,

ovrszd · Feb 18, 2018

kirkawilson said:
Here is one on 'fleabay'.Vintage AC Delco RPM Handheld Tachometer Gauge HT1 1536486 | eBay

There ya go, definitive proof!!!!

Coyote machine · Feb 18, 2018

The AC lettering on top is definitely from AC/Delco, the electronics division of GM, not Allis Chalmers.

bcp · Feb 18, 2018

AC = Albert Champion

Albert Champion (cyclist) - Wikipedia

...In 1905 he incorporated the Albert Champion Company in Boston to make porcelain spark plugs with his name on them. Three years later founded the Champion Ignition Company in Flint, Michigan. In 1922 he changed the name to AC Spark Plug Company...

Bruce

2ndhalf · Feb 18, 2018

It would be handy to have for PTO speed reference.

Ron Bosse · Feb 18, 2018

I know Allis Chalmers combines used a Tachometer to time the belts on the shakers depending on what you were harvesting. Clover seed, wheat, oats, etc..