Speedbox for LS swap

Modified FSJ Tech Area
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Speedbox for LS swap

Postby 81waggy » Wed Mar 07, 2018 9:37 am

I'm getting ready to do something with my gauges and looking to see if anyone has any opinion on using something like speedbox and kept their factory gauge cluster.


I've heard some guys talk about needle bounce in the original cluster, but didn't know if you still get that in the swap.

The other option is this:
gauge cluster.jpg

and I would still need to run new turn signals and high beam indicator.

Speedhut is a lot cheaper and keeps my original gauges, although I'll still need the adapters for the temp/oil/and the ammeter/voltmeter swap.
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81 Wagoneer with a TBI 350 Vortec...More Power!

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Re: Speedbox for LS swap

Postby aaronsjeep » Thu Mar 15, 2018 1:37 pm

Hey 81 Waggy,

I have been looking into similar options, for an LS sway Waggy I have. This one is a 5.3 with NP 241c which is great for the VSS, but leaves me to figure out how to power the speedo.

I am leaning toward keeping the factory speedo, Speedbox and Cable X are two of the options I am eyeing. Another is having a Speedometer shop convert my factory speedo to be run by the VSS signal.

A friend gave me this link with a lot of great info that may help: http://newvintageusallc.mybigcommerce.c ... ramax-etc/

Let me know what you decide,and I will do the same.

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Re: Speedbox for LS swap

Postby sonoraed » Sun Mar 18, 2018 7:23 am

be advised New Vintage tech support is crap, just installed new a set in a 71 El Camino SS fuel guage went to full with 1/2 tank ended up being a bad connector in oem wiring, which in retrospect should have been a no brainer for a guy at a company that builds guages, good lesson for me, I'm in the middle of the fuel guage problem with my 79 J10 5.3 LM7, 700R4, D20, 99 burb fuel tank, 86 dash panel problem!

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