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Product # 3780

  • 3-3/4" (95.3mm)
  • Air-Core Air-Core
  • 0-8,000 RPM
  • Incandescent
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Since 1957, AutoMeter has set the standard in performance, accuracy and durability with their legendary Tachometers. The absolute pinnacle of engineering and technology, it’s no wonder AutoMeter can lay claim to more motorsports victories than every other gauge manufacturer combined. The patented air core meter movement, wound in house to exacting standards, can move the needle from 0 - 10,000 rpm in 333 milliseconds. An inaugural inductee to the Hot Rod Speed Parts Hall of Fame, no other tachometer on the market has had anything approaching its impact on professional racing. Built for a lifetime of service under the harshest conditions, this is the no compromise tach for no compromise builds. When you’re ready for the best, there isn’t another choice.

Feature Points

  • Traditional incandescent lighting illuminates around the perimeter of the dial
  • 12 and 16 volt compatible, well-suited with nearly every street car or race car electrical system
  • Gauge kit includes bulb and socket assembly, red and green bulb covers, mounting hardware, and detailed instructions for installation
  • AutoMeter’s race proven air-core electric tachometers provide quick and accurate readings with a needle so responsive it can go from 0 - full scale in 333 milliseconds
  • Compatible with most 4, 6, and 8 cylinder engines (2 - 4 pulse per revolution ignition signals) with points, electronic, and most 12V high-performance racing ignitions.

Bulb & Socket

  • 3212

Light Covers

  • Red 3214 & Green 3215

Mounting Hardware

  • 3209
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Can the 3780 also be mounted in dash?

Asked by: Iowabucks
Thank you for your inquiry. The outer cup on the 3780 is removable for calibration access. The inner cup will drop into a 3-3/8" hole. You will be responsible for fabricating something to hold the tach in the dash hole.
Answered by: Jim from AutoMeter
Date published: 2019-05-28

I need a wiring diagram for the sport comp tach

Asked by: Kyle Duckworth
Thank you for your question. Here is a link to our installation and wiring instructions for this tachometer: https://www.autometer.com/media/manual/2650-1139.pdf
Answered by: Zach from AutoMeter
Date published: 2019-05-10

I have an older 3780 tach that I need to modify the wiring to mate with my factory harness. What gauge wire does this tach use? I can count the # of strands in each wire, but I do not have a micrometer to measure the diameter of the individual strands.

Asked by: stagedgs
Thank you for your question. The 3780 Tach has 20 gauge wire leads coming off the back.
Answered by: Zach from AutoMeter
Date published: 2019-04-02

Hi, do you supply replacement bezels as I have damaged mine. Uk customer.

Asked by: Bugman125
Hi Bugman, thank you for the question. Since the bezels are actually machine pressed on, we do not offer them separately as an accessory or service item. We can replace a damaged bezel, but it would have to come into our factory in the U.S. for that service.
Answered by: Matt from AutoMeter
Date published: 2018-10-16

Is Tach. gauge Product # 3780 compatible with MSD CDI Street Fire ignition P/n 5520?

Asked by: Tanner
Thank you for your question. Yes, 3780 can be used with your MSD Street FIre ignition and will work in your application.
Answered by: Zach from AutoMeter
Date published: 2018-10-02

Is the tach waterproof? Want to mount outside on the hood of a 1972 roadrunner...if not do you sell any that are thanks!

Asked by: Mikey340
Hi Mikey, thank you for the question. We actually do not offer any completely waterproof tachometers. We offer a several Pro-Cycle and Marine tachometers that are water resistant on the front only, but nothing that would be recommended for outside hood mounting that would be exposed to the elements.
Answered by: Matt from AutoMeter
Date published: 2018-08-15

I have an older 3780 with the "long life bulb" and it has burned out. I found out the hard way that it is not serviceable, and ruined the aluminum bezel around the gauge face. Can AutoMeter repair the bulb and replace the bezel for me?

Asked by: Johnny5
Hi Johnny, thank you so much for contacting us. We're happy to help you with repairs to your tach. You can send it right to the factory here in Sycamore and we'll get you taken care of. Our s3ervice information form can be found here: http://www.autometer.com/media/Service_Form.pdf Hope this helps!
Answered by: Joseph At AutoMeter
Date published: 2018-04-11

Hi, Does the 3-3/4" PEDESTAL TACHOMETER come with the cup and bracket and if so is the bracket the shock bracket?

Asked by: Bill
Hi Bill, thank you so much for the question. Yes, the 3780 Tachometer will include the cup and bracket and it is the shock strap model 3209 that is included.
Answered by: Matt from AutoMeter
Date published: 2018-02-01
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