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 How To Connect An Aftermarket TAC to a 91? | Joined: Aug 2009 Posts: 756 Likes: 5 old hand | OP  old hand Joined: Aug 2009 Posts: 756 Likes: 5 | How do you go about connecting an aftermarket tachometer to a 1991 with a 5.0 and the stock TBI (throttle body injection) system? Is there a certain type of TAC I should use? No racing, just a cruiser…just want to be aware of what the engine is doing.
Thanks
Recently purchased (10-2021) a 1991 Chevy G-20 “Shorty”. Past vans are a 1976 Chevy G-10 (purchased new in 1976 & sold in 1995). A 1978 Chevy G-20 Shorty purchased in 2010 and sold in 2015.
| | | Re: How To Connect An Aftermarket TAC to a 91? | Joined: Nov 2013 Posts: 1,723 Likes: 17 veteran | | veteran Joined: Nov 2013 Posts: 1,723 Likes: 17 | Hey there, I'd think you could take the signal wire and attach it to the negative on the coil, I believe is where it goes. If I am not mistaken.
Ford or Chevy!
"Who New? Blue" 1990 Chevy G30 454 Church Van, maternity division "DogVan" 1988 Dodge B250 "Cabin Cruiser" '94 Dodge B350 www.xplorermotorhome.com/Xplorer MH model 230 230 hp MPI 360 LA Wedgy OD auto Old vans are getting pricey! | | |  Re: How To Connect An Aftermarket TAC to a 91? | Joined: Aug 2002 Posts: 16,900 Likes: 73 Supreme Master | | Supreme Master Joined: Aug 2002 Posts: 16,900 Likes: 73 | Yeah it's the negative side. Here is a video that might help. youtube link
![[Linked Image from i.imgur.com]](https://i.imgur.com/juWbW5e.jpg) Arianrhod:2003 Chevy Astro Black Magic: 1985 Dodge B-250 Serenity:1985 Chevy G-20 The Outcast:1983 Ford club wagon Luna 1974 VW bay window transporter Freedom:1990 Ford E-150(parts van) Outcast Vanners van club Support your local 2% | | | Re: How To Connect An Aftermarket TAC to a 91? | Joined: Aug 2009 Posts: 756 Likes: 5 old hand | | OP old hand Joined: Aug 2009 Posts: 756 Likes: 5 | Well I found a video on U-Tube that shows (and explains) that there is a white wire coming out of the coil pack that is not used for anything (that I am aware of anyway) but you connect the “tac” or green wire to that white wire…has a factory type connector on it (found mine today) and I will (when the the time comes) see if I can find the “correct” connector to make the connection.
Recently purchased (10-2021) a 1991 Chevy G-20 “Shorty”. Past vans are a 1976 Chevy G-10 (purchased new in 1976 & sold in 1995). A 1978 Chevy G-20 Shorty purchased in 2010 and sold in 2015.
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