BenzWorld Junior Member
Date registered: Dec 2009
Vehicle: '70 280 SE 2.8
Location: Torrance, CA
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drew, grubeguy is correct, that car is not bad at all.
Amazingly, most modern engines are pretty self contained as far as wiring. Most of it just goes back and forth between the ecu and engine/trans. Some of the auxiliary stuff also already has wiring coming out for it, such as for the fuel pump. Gauges generally have their own sensors plumbed on the engine, sometimes the biggest problems come from incompatible tach signals, and speedometers. As long as you keep the original engine and trans together, you usually don't have a lot of stuff that needs to be intertwined. Most of the time you will have a main power, ignition switched power, and some heavy wire for the starter.
A/C stuff usually has its own high and low sensor switches, so you just need to power the compressor with one wire.
Most problems I've seen lately is the extensive use of bus systems, some of the modules in the car NEED to be installed with the engine ecu, just so it sees them in the loop to know nothing is wrong. The 98+ Lexus VVTi V8 is a good example in the GS chassis, it has a bus that runs through modules everywhere plus in the doors and the gauges. Most of the gauges run off a multiplexed signal as well, which takes some tricky work sometimes to overcome.
Many newer cars also have drive by wire throttle, so you would need to bring the potentiometer function in somehow or another.