Tach-nical question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

87chevy.com · 03-05-2011, 07:49 PM

Has anyone tried to use any non aftermarket gauges in their LSx swap? I was at the bone yard today and was looking for a 81 model style camaro tach. My goal was to take that apart and stick it behind my 87 fuel gauge frame after I remove the fuel sender, paint it all black and put vinyl stickers for the hash marks to make it facotry like... and hidden in plain site

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Well there was only 1 gauge cluster at pick-n-pull and it was in rough shape so I passed... on in went to the truck section to see what that had... nothing worthy... and so I went looking for any tach... shame on me as I went to the buicks and so on... found tons of V6 6k tachs ... that would be great but dont know how to convert a v8 signal to a v6. Alright so now I invested about 7 bucks in gas to get there, 2 bucks to get in... I started to make my way to the ford car section. found a cherry 7k cluster out of a Murcury Cougar XR7 with a v8... Im like Ill peel it apart and see if it will work. It had 4 pins that go to the PC board. All pins were marked as B+, GND, SIG and CYL. Tach costed 9 bucks..
I cut the wires to the AutoGauge Tach and wired in the 3 normal ones and it didnt work. dang. Installed heat shrink around the bare wires and put em out of sight. I got home and chekced out all data and got a wiring diagram and it shows to have the CYL (select) to ground with the note of 4.6 which is a V8... gonna try that one out tomarrow as I didnt bring my test wires with me.

So anyone ever run a non factotry tach in your truck?
clint

03-05-2011, 07:49 PM	#1
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,266	Tach-nical question Has anyone tried to use any non aftermarket gauges in their LSx swap? I was at the bone yard today and was looking for a 81 model style camaro tach. My goal was to take that apart and stick it behind my 87 fuel gauge frame after I remove the fuel sender, paint it all black and put vinyl stickers for the hash marks to make it facotry like... and hidden in plain site . Well there was only 1 gauge cluster at pick-n-pull and it was in rough shape so I passed... on in went to the truck section to see what that had... nothing worthy... and so I went looking for any tach... shame on me as I went to the buicks and so on... found tons of V6 6k tachs ... that would be great but dont know how to convert a v8 signal to a v6. Alright so now I invested about 7 bucks in gas to get there, 2 bucks to get in... I started to make my way to the ford car section. found a cherry 7k cluster out of a Murcury Cougar XR7 with a v8... Im like Ill peel it apart and see if it will work. It had 4 pins that go to the PC board. All pins were marked as B+, GND, SIG and CYL. Tach costed 9 bucks.. I cut the wires to the AutoGauge Tach and wired in the 3 normal ones and it didnt work. dang. Installed heat shrink around the bare wires and put em out of sight. I got home and chekced out all data and got a wiring diagram and it shows to have the CYL (select) to ground with the note of 4.6 which is a V8... gonna try that one out tomarrow as I didnt bring my test wires with me. So anyone ever run a non factotry tach in your truck? clint __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress



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