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01-30-2013, 09:40 PM | #1 |
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Location: Jacksonville, FL
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Quick question about factory tach
My awesome wife bought me the factory reproduction tach from LMC for my birthday and I'm trying to find info before I install it. I have an 83 K10 Scottsdale with all the gauges and warning lights but no tach. I know I will have to get a new circuit board for the back, but will the tach fit in the old fuel gauge hole, and the new fuel gauge fit in the clock hole without modifying it?
If so does anyone make the or sell NOS instrument trays? Thanks, Dan Posted via Mobile Device
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Dan 83 Chevy K10 Scottsdale, ZZ4, TH700r4, 4.10, 33" |
01-30-2013, 10:10 PM | #2 |
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Location: St Charles Illinois
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Re: Quick question about factory tach
Did you get the small fuel gauge for trucks with factory tach? I'm pretty sure they fit right up. GM is all about cost cuts, 2 instrument trays is not GM like.
Does your new tach have 3 posts sticking out the back? The fuel gauge is 3 posts, one hot, one ground, and 1 for the sender feed. So if yours is 3 posts too, I bet the new circuit makes the sender feed into tach feed, so it should slip right in! Best of luck with the set up! Also check your distributor where the ignition wires come out the side of the top. One of the posts is labeled TACH, if there is no wire going to that post, you will need to run a TACH wire to your dash circuit or however you wire this up. |
01-30-2013, 10:56 PM | #3 |
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Re: Quick question about factory tach
The tach you got from LMC is a replacement tach for a tach cluster and not designed to work with your standard gauge cluster housing. It will take some considerable modifications to your cluster housing, a printed curcit, a tach harness, and repinning of your cluster plug for everything to work.
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John 82 Chevy Silverado 350ci/TH350 |
01-31-2013, 02:36 AM | #4 | |
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Re: Quick question about factory tach
Quote:
I also agree on the two styles of inst trays. Dan
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Dan 83 Chevy K10 Scottsdale, ZZ4, TH700r4, 4.10, 33" |
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01-31-2013, 02:41 AM | #5 | |
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Re: Quick question about factory tach
Quote:
Thanks, Dan
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Dan 83 Chevy K10 Scottsdale, ZZ4, TH700r4, 4.10, 33" |
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01-31-2013, 07:26 AM | #6 | |
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Re: Quick question about factory tach
Quote:
Posted via Mobile Device
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John 82 Chevy Silverado 350ci/TH350 |
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01-31-2013, 10:28 AM | #7 |
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Re: Quick question about factory tach
there are some people adding a tach with fuel gauge
but as a seperate small one,it's over with the other gauges cept when air/vac/clock I went from idiots to tach gauges without the right case your gona have to cut it/to fit through the back don't use the fuel conections they don't line up factory, the tach wired throught the firewall when i did mine I wired the tach power to the rest of the cluster power crimp on connetors will fit had to add a ground for the small gas gauge...but no more big bouncy gauge
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
02-01-2013, 01:24 AM | #8 | |
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Re: Quick question about factory tach
Quote:
Im a little confused about what you said about the small gauges, will I need to modify the hole more than just drilling the post holes when I replace my clock with the small fuel gauge?
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Dan 83 Chevy K10 Scottsdale, ZZ4, TH700r4, 4.10, 33" |
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02-01-2013, 11:22 AM | #9 | |
78K & 79C Jimmys
Join Date: Nov 2009
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Re: Quick question about factory tach
Quote:
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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02-01-2013, 02:44 PM | #10 |
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Re: Quick question about factory tach
I'm just gonna order the circuit board and give it a shot when it comes in. I will post pictures as I go when I do. Thanks all for the insight.
Posted via Mobile Device
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Dan 83 Chevy K10 Scottsdale, ZZ4, TH700r4, 4.10, 33" |
02-01-2013, 04:32 PM | #11 |
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Location: Sherman, ME
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Re: Quick question about factory tach
Hi Dan,
You'll definitely have to do some modifications to the plastic cluster housing to make a factory/reproduction tach and the associated smaller fuel gauge fit. Here is a pic showing a gauge cluster housing and a gauge/tach cluster housing. They're older housings for a mechanical oil gauge but will still give you an idea of the differences in the tach and fuel gauge areas: The dingy/dirty looking housing is from a regular gauge cluster and the clean white one (painted with Krylon Fusion plastic paint) is from a tach/gauge cluster. Over on the tach side it looks as though you can simply cut the big opening and screw the tach right in. The mounting points are already there. But over in the lower left corner is going to be a bit more involved. You'll have to cut away the baffle that used to be for the "BRAKE" light and probably graft in the chunk of plastic with the 3 little square holes for the gas gauge terminals that you cut from the other side. The small gas gauge shares it's lower/right mounting screw with the neighboring temp gauge. But the non-tach cluster doesn't have a place for the screw that holds the upper/left corner of the small gas gauge so you'll probably have to make something there. Now, if your existing cluster has a clock (instead of a "BRAKE" light) down in that lower/left corner it might make it easier to fit the small gas gauge in there but I don't know for sure. |
02-01-2013, 10:22 PM | #12 |
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Re: Quick question about factory tach
Great pic thanks. I do have the clock and it looks like the tach cluster's bottom left, if memory serves me right. Thanks again for the pic, that is exactly what I was looking for.
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Dan 83 Chevy K10 Scottsdale, ZZ4, TH700r4, 4.10, 33" |
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