tach - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**53burb** · 01-26-2005, 10:31 AM

A friend just gave me an old Sun tach. The wires coming off it are red, black, green, and white. I assume the red is for power and the black is ground. Which wire is for the tach and which one is for the light?? It also has a zero correction slide switch in the back. How do I verify the correct position??

**'70_402** · 01-26-2005, 10:49 AM

green tach...white light..don't know about the switch

67ChevyRedneck · 01-26-2005, 10:51 AM

does the slide switch say "4 6 8"?? That's the # of cylinders the motor has. 4 for 4 banger etc.... Thats the only "switch" on the back of my sun pro tact.

**53burb** · 01-26-2005, 11:14 AM

Nope, there is a 4,6, and 8 cylinder switch in addition to the zero correction slide switch.

67ChevyRedneck · 01-26-2005, 11:36 AM

Then I have no idea

sorry

**53burb** · 01-26-2005, 02:26 PM

Thanks for the info guys. I will hook it up and hopefully there won't be too much variance from one position to the other. I'm hoping it will be less than 100rpm from one side to the other.

01-26-2005, 10:31 AM	#1
53burb Senior Member Join Date: May 2004 Location: Queen Creek, AZ Posts: 1,015	tach A friend just gave me an old Sun tach. The wires coming off it are red, black, green, and white. I assume the red is for power and the black is ground. Which wire is for the tach and which one is for the light?? It also has a zero correction slide switch in the back. How do I verify the correct position??

01-26-2005, 10:49 AM	#2
'70_402 Senior Member Join Date: Dec 2003 Location: Pampa, Texas Posts: 1,553	green tach...white light..don't know about the switch __________________ https://www.ebay.com/itm/29620574751...mis&media=COPY

01-26-2005, 10:51 AM	#3
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	does the slide switch say "4 6 8"?? That's the # of cylinders the motor has. 4 for 4 banger etc.... Thats the only "switch" on the back of my sun pro tact. __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

01-26-2005, 11:36 AM	#5
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Then I have no idea sorry __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

01-26-2005, 11:14 AM	#4
53burb Senior Member Join Date: May 2004 Location: Queen Creek, AZ Posts: 1,015	Nope, there is a 4,6, and 8 cylinder switch in addition to the zero correction slide switch.

01-26-2005, 02:26 PM	#6
53burb Senior Member Join Date: May 2004 Location: Queen Creek, AZ Posts: 1,015	Thanks for the info guys. I will hook it up and hopefully there won't be too much variance from one position to the other. I'm hoping it will be less than 100rpm from one side to the other.



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