How to install a tachometer in a first generation s10 or blazer

[@johnscreekmark]

There is a tachometer signal-wire connector on the firewall, right next to the wiper motor. I think it was included for vehicles equipped with Tachs. I wire-clamped a tach-wire to it and ran wire through a firewall hole, up by the fuse box to a mini-tach that I mounted using double-sided Velcro.

[@harwoodhomies]

Thanks for posting this. I just installed a tachometer in my 1993 Sonoma today with the help of this video. If you would like to get rid of the delay when you start it you can hook the positive wire to IGN instead of ACC.

[@CoroPlanesLLC]

If you pull the carpet back on the passenger side up by the firewall you will find a wire the same color as the one on the coil. It should have a connector in the middle of the wire. This is the wire you disconnect when setting the timing on your 1st gen s10. This is the Tach wire. You could do the install without running a single wire outside the cab of the truck. Makes for a cleaner install.

[@MichelLinschoten]

Ahhh thank you for this comment should be pinned !

[@davidjordan780]

I'll look for that when i do mine on my 92 S10. Ive been wanting one bad. I have to put in a aftermarket temp gauge so i'll do it at the same time. My temp gauge jumps up and down out of control. I assume its broken.

[@ADAMSVEND]

David Jordan did you do it

[@frankrizzo442]

Are you referring to the tan wire with the black stripe on it? It's underneath where the heater core is.

[@jairoaguilar8342]

Thanks for the heads up! Do you, or anyone by any chance know where I can get a wiring diagram on the first gen of these vehicles?

[@endersphel7398]

I plan to install a tachometer in my 1991 Chevy s10 and this video is perfect. My vehicle is a manual and I'm not really a fan of listening to the sound of the engine to guess rpm and relying on the "shift" light, lol

[@_BaguetteDoggo]

this exactly, i hate just listening to it lol

[@johnscreekmark]

I like how you mounted the tach. using that screw means you don't need to drill holes or mess up anything with the dash. Keep it original!

[@Rattenomics]

Thanks for the video man! Can't wait to install my tac on my s15 jimmy!

[@davidjordan780]

thanks for the video, now i feel confident I can install one on my S10 pickup, auto.

[@DrShankenstein]

Good job! Thank you so much for posting this!

[@nicolaswagoner8036]

I’m having a hard time find my vin stamp on my 86 s10 2.5l

[@Nastynoiz]

Where did u purchase the tachometer

[@zoefaith120]

I also have a 92 S10 with Manuel and it bothers me a 5 speed with no tachometer. How long it took you to do this?

[@ne14lov22002]

15 minutes

[@Oroborus710]

Could you provide some info on the exact tachometer you got? that particular one might go well with the chrome bumper on mine

[@blakethepoolguy7128]

IDK lol but it came off the shelf at AutoZone. It's been so long. I sold that blazer

[@Oroborus710]

@@blakethepoolguy7128 lmao thanks anyway, I didn't even think to look for one at a parts store

[@dontcrossm3]

Ok. No engine model description? 4.3? L W No tach model description? Equus ?

[@junjun7617]

My truck doesn't go past 500 on idle in drive and at 500 in park I don't know why the idle is so low does anyone know

[@endersphel7398]

May I ask the year and model of your truck? To me, it sounds like a stuck idle air intake. Most vehicles should start at a high idle until they warm up a bit, then they should drop to roughly 650rpm. However, it can be a wide range of things causing such a low idle. To help, I'd really need more information

[@katsumiskytower8714]

Idle Air Control (IAC) Valve is going bad. their cheap on rock auto :)

[@blakethepoolguy7128]

Sorry I kept saying mine was a second gen towards the end of the video. Mines a first gen and I could only find videos on the second gens