55.2-59 Setting idle speed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**popeyestruck** · Today, 01:59 PM

235 motor with HEI distributor with coil inside it. I have an old sun tach/dwell meter with 2 leads 1 black one red. Havent used it in 20 years. I want to set the idle rpm . The HEI distributor has a green tach wire that I capped off. If I connect the red lead to this and the black to a ground will this function as a tach? Just making sure I dont want to burn out the distributor. Never did this with an HEI

**mr48chev** · Today, 04:58 PM

It should. The tach pickup on the distributor should work with most "shop" tachs.

My new distributor for my 77 came yesterday so when I get it swapped I'll try to remember to dig out one of my old dwell meter/tachs and see if it works.

**popeyestruck** · Today, 05:39 PM

Thanks ! I cant think of any other way it would work. Had this old engine tune up dwell /tach ,compression tester , remote start ,vacuum tester buried away. Dug it out the first time in 20 or 30 years but its in perfect condition

Today, 01:59 PM	#1
popeyestruck Senior Member Join Date: May 2022 Location: Longwood 59 chevy Posts: 327	Setting idle speed 235 motor with HEI distributor with coil inside it. I have an old sun tach/dwell meter with 2 leads 1 black one red. Havent used it in 20 years. I want to set the idle rpm . The HEI distributor has a green tach wire that I capped off. If I connect the red lead to this and the black to a ground will this function as a tach? Just making sure I dont want to burn out the distributor. Never did this with an HEI

Today, 04:58 PM	#2
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,754	Re: Setting idle speed It should. The tach pickup on the distributor should work with most "shop" tachs. My new distributor for my 77 came yesterday so when I get it swapped I'll try to remember to dig out one of my old dwell meter/tachs and see if it works. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.

Today, 05:39 PM	#3
popeyestruck Senior Member Join Date: May 2022 Location: Longwood 59 chevy Posts: 327	Re: Setting idle speed Thanks ! I cant think of any other way it would work. Had this old engine tune up dwell /tach ,compression tester , remote start ,vacuum tester buried away. Dug it out the first time in 20 or 30 years but its in perfect condition

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