In this instructable I will show you how I installed an aftermarket tachometer on my ‘91 Chevy S-10. Tachometers are a great tool for your vehicle if you enjoy monitoring your engine speed or idle. In fact, they are nearly a necessity for a vehicle with a manual transmission. 

Step 1: Parts & Tools

Tachometer - - - - - Can be purchased from most any auto parts store for as low as $33. Mine was salvaged from my old truck
3M quick splice connectors 14-18 gauge - - - - - $4.10 (Walmart)

Wire cutters
Wire strippers
Automotive diagnostic tool-used for finding tachometer wire 
Ratchet and sockets

<p>All we really want to know is where the wires go and it 'd be nice to have that clear up front before looking through all the lovely pics. In fact it is never clearly stated.</p><p>I don't think so anyway. Is it? Main thing is the tacho is connected to the wire from the coil to the distributor. That's it. Right?</p><p>Then it is powered as usual by 12v and an earth. And then it has more power being 12 for the light.</p>
I discuss that in steps 2-4. Black, Red and White go straight to the fuse box for ground, ignition power, and light power (connected with the dash lights). The green wire gets crimped to the output from the distributor cap
Hai i brought a speedometer from kinetic gf 125 bike, i want to install it to my bajaj bike it has 4 wires orange, black, white and yellow plz any body tell me how to connect the wires
<p>i dont think anyone has mentioned it yet... you should have put a grommet in the hole where cable goes through the firewall.......doubt you would start a fire tho, like some muppet suggested</p>
<p>what about diesel engine?</p>
This is really cool. Now i will be able to mitigate some of the cost of <a href="http://www.nationaltransmission.ca/about_us.htm" rel="nofollow">transmission repair calgary</a>.
You need to install a rubber grommet where the wire goes through the firewall so it doesn't cause a short. The way you are running it is dangerous it could start a fire if the wire were to short out.
You really should add a grommet between the wire and the firewall or else vibrations will cause the firewall to cut the sheathing and make issues later.

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Bio: "CAN'T can't do anything until TRY comes along and does it" -Grandpa
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