wheelman Posted April 13, 2006 Share Posted April 13, 2006 It's possible to use the stock tach and drive it from the PCM. I have a 240 and replaced the guts of the tach with those from a 280 (came with the car when I bought it), hooked the input to the PCM and provided ground then adjusted it as per the JTR manual. I forget which output pin I connected to on the PCM but there is a thread on here that discusses it. I did perform a more accurate adjustment to the tach than the JTR manual calls for by hooking a laptop to the PCM and using scanning software to see the RPM then adjusted the tach to match. I don't think the tank from the 93 F-Body will fit, those who've swapped to F-Body tanks use them from the LS1 powered cars. There are several threads here with good pictures about the swap. The LT1 does have an OBDI warning light and the PCM will through a code and go into limp mode if it's missing. I didn't want it so I simulated the light using a small resistor to connect the line to ground. Wheelman Quote Link to comment Share on other sites More sharing options...
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