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tach wire question?BMoney 03-27-2007, 01:42 PM I have a 96 Formula, with a gen I small block in it now. I have a HEI distibutor, and want to know if anyone knows how I can hook up the factory tach? do you know what wire to connect to the distibutor? thanks in advance. Brian BMoney 03-29-2007, 04:13 PM anyone??? I want to use the factory tach, someone has to know what wire/wire's to use. shoebox, injuneer, HELP! Dave89IROC 03-29-2007, 07:57 PM carbed? chevynutman 03-29-2007, 08:45 PM you need to find diagram of tach wiring to see how many it uses,if it is one power and one is ground you just hook power from power side of tach to dist.and you should know where ground goes if factory tach uses more than two wires then i'm sorry i can't help Dave89IROC 03-29-2007, 09:14 PM well, you hook the factory tach wire to the tach terminal on the dist. BMoney 03-30-2007, 04:14 PM how do I find the tach wire? and how can I tell which one it is? do I have to pull the dash apart? thanks for the info Dave89IROC 03-30-2007, 05:12 PM first, I assume the OE PCM is removed? is the complete engine harness removed? are the plugs behind the pass. kick panel(that the engine harness connects to) still there? BMoney 03-30-2007, 08:40 PM the computer and the whole harness is still in the car. Dave89IROC 03-30-2007, 08:50 PM but the computer isn't doing anything, correct? BMoney 03-30-2007, 09:54 PM I still have everything there, it controls my speedometer, Im not sure if I still need the computer or not. I just didnt want to rip it out if I was gonna need it. I am waiting til I get everything all set before I start cutting out wires. BMoney 03-30-2007, 09:55 PM Im not sure what else the computer is doing. Dave89IROC 03-31-2007, 04:40 AM Im not sure what else the computer is doing. speedo is probably it I'll get you wire/connector you need to use and get back to you later today BMoney 03-31-2007, 02:24 PM thank you very much! Dave89IROC 03-31-2007, 02:36 PM ok look here http://shbox.com/1/harness_connector_faces.htm select C230 at the bottom, this connector is located behind the pass side kick panel, use the wire colors to locate the correct connector, it is pin D that you want to use, this is the wire that goes from the PCM to the cluster, I don't know exactly which wire it is at the PCM though, but from this connector, you can either trace it to the PCM, or just cut the wire there and extend it to the Dist. BMoney 04-01-2007, 11:05 PM I think that is exactly what I was looking for, thank you very much. Brian BMoney 04-18-2007, 05:38 PM ok, so I finally got out into the garage and hooked up this wire. now the tach works, its just off and not accurate. at idle it shows that its at 2500 rpms. and if I hit the gas some (about 1/2-3/4 throttle) it jumps to 7000 and pegs there! anything I can do to adjust this? thanks Brian | ||