How to Trigger A/C Clutch Relay in LS3 Swap Using Low-Current 5V A/C Request Signal?

Ok guys this is a little difficult to explain...

I have a 1990 Corvette that originally had a 350 TPI engine in it. I swapped that engine out for a LS3 from a 2010 Corvette...

My only problem is that I can't get the A/C compressor clutch to switch on.

Originally the A/C clutch was activated by the original engine's ECM which has been removed from the car.

What I have is the "A/C Request" wire (Circled in dark red in the diagram) that supplies 4.950 volts and 0.001 amps when the A/C is off and no voltage when the A/C is on. I tried using a 5VDC SPDT relay but the A/C request wire obviously won't trigger it due to the low current. I need to use that relay to ground the wire (Circled in bright green) that triggers the A/C clutch relay when grounded. The wire circled in green is 12 volts and 0.250 amps.

Is there any way to amplify the request wire just enough so it triggers the relay?

Does anyone have any other suggestions on how to go about this? Thank you!!!!

Link to diagram:

http://i14.photobucket.com/albums/a340/Madness86/xc.jpg

It looks like all you need is a low side switch. A NFET or NPN would work fine for the switch, but a FET will be easier to drive in this case since the bipolar would need to have a gain of at least 250.

Something like a IRLML0030 should work fine. It runs very well with 5V gate drive and goes from open to dead short for your purposes. It's 30V capability allows for some transients, but you may still want to put a small cap between drain and ground. 1nF should be fine. Also make sure to put a catch diode from drain to +12V else the inductive kickback when switching off could kill the FET.