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Thread: 1995 TBI to LS truck motor questions

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  1. #1
    Join Date
    Mar 2016
    Location
    BC Canada
    Posts
    86
    You reuse your oil psi sender on the LS engine, which keeps your oil gauge working, and to get coolant temp on my truck I installed a 3 wire f-body coolant temp sender on the LS engine. Then just hooked trucks wire up to that. Your fuel level gauge is un affected. The white wire for the truck tach hooks onto the engine speed signal wire from the ls pcm. Easy peasy
    1995 rcsb c1500, 4/6 drop, 5.3 L33, 5spd, 219/228 112LSA cam, LS6 springs, 799 heads, long tubes, magnaflow mufflers

  2. #2
    Join Date
    Feb 2017
    Posts
    16
    Quote Originally Posted by brianmcb View Post
    You reuse your oil psi sender on the LS engine, which keeps your oil gauge working, and to get coolant temp on my truck I installed a 3 wire f-body coolant temp sender on the LS engine. Then just hooked trucks wire up to that. Your fuel level gauge is un affected. The white wire for the truck tach hooks onto the engine speed signal wire from the ls pcm. Easy peasy
    One of these threads for a 93 or 94 I read that you pitch drak box splice the red and blue wire to the vss wire from the ls harness to enable the speedo and cruise. This hold true for the 95 as well? It has the drak box under the pcm. The tach feed connection mated at gauge or pcm? I assume the tach feed and SES lead from the ls wire harness are connected in the lead to the instrument panel, thus eliminating feed from the original pcm feed to the new ls feed? Is the 3rd wire coolant feed mated here as well? The ls install and getting it running seems to be easy part of the swap, the grafting of the two is harder to wrap my head around. Or are all these connections made on the leads feeding the trucks pcm, and the original pcm remain intact, just receiving feeds from new sources? I am probably thinking way too hard about this. Anyhow, thanks for the input, and keep info coming.

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