How to Megasquirt your 3G Hemi

John-

Here are my numbers. Probably different than what yours will be:

Megasquirt 3x box assembled with $12 pull-up: $657
MS3 wiring harness (8 ft): $67
MS3x wiring harness (8 ft): $72
Innovate O2 sensor (MTX-L): $199
Bosch 211 (I bought Meyle): $140 ($70x2)
Bosch 211 connectors: $27 (outlined below)
Factory connectors for injectors, coil packs, cam sensor and crank sensor (and alternator):$150 for factory harness from junkyard
TPS Sensor & plug: $140 (specific to your throttle body)
Idle Air Control Valve & plug: don't have one
GM Intake Air Temp - open Sensor & Plug: $20
GM Coolant temp sensor and plug: $16.25
Cable driven throttle body: don't have one
Throttle body adapter (if running GM cable driven throttle body): n/a
3 relays: $24 ($8x3, including wiring)
A bunch of extra wire: $40
Buy Tunerstudio & MegaLogViewer software: $60
Hilborn intake: a lot

Total without intake, injectors, coil packs, and cam/crank sensors is: $1512
You would save money with a different TPS (gm is like $46 new, $10 used, vs my $140)
To compare to FAST or factory option, add the price of a TB, adapter, and idle valve. I'm guessing both of those options include an o2 sensor, TB, all wiring, relays, connections, sensors, but realistically you'll probably still need a couple things.

The complete list of items you might or might not need with prices is above in post #1.