The '98 fuel pump is more than up to the task for a stock engine. The fuel pump relay can also be used but must get it's actuating power from the new PCM. I found this out by mistake. I used my existing relay/computer and when I started the engine, it died in about 10 seconds. Turns out, the old PCM would power the relay and the system would prime for start. After it started, the old computer powering the relay didn't "see" any information coming from the engine(crank signal, rpm, etc), so it would de-engergize the relay. I simply used the fuel pump relay wire from the new PCM to energize the existing relay. It worked like a charm.
Your new PCM should power the alternator, but I would retain the existing battery idiot light wire(if equipped).
As for keeping things simple as possible, you need to power the new PCM. You will also need to get it flashed to remove the VATS(Vehicle Anti Theft System).
You need to retain all your wires for the instruments(oil pressure, voltage, rpm, water temp,).
As for soldering connections, there will be some of that required. I don't rely on crimped and taped connections on something that I will be driving. Nothing is worse that being stranded somewhere due to a loose connection. Solder them and shrink wrap them.
Not sure if you can use the LS type compressor in these trucks. I read something about it and it requires frame notching.
Since you already have an OBDII system, only one wire is required to run to the new PCM. This way you can read any codes that may pop up.
Last edited by Mickeymotormount; 03-10-2013 at 07:26 AM.
'93 Chevy 1500 4X4 ECLB with a '99 Silverado LQ4 6.0 and '99 Escalade 4L60E. SOLD IT!!
New toy: 2001 2500 HD 4X4 Extended Cab Long Bed
John
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