obd2 b18c1 in 95 LS shell tach help

[IshbOO]

I know this is probably a common problem.

I have an obd2 b18c1 from a 00 gsr into my 95 LS shell.

Running p72 obd1 gsr ecu.

Using obd2 gsr engine harness.

My tach will not work, I've heard others with the same problem.

Some people say run a wire from the distributor to my tach wire on driver side.
Others say that this gives inaccurate reading, and makes needles jump.

Anyone know what the problem is or know of a fix? thanks.

[JustRob]

How are you using an OBD-II engine harness in an OBD-I car? And what year and motor distributor are you using?

[IshbOO]

The engine harness works fine. Its just that 1 part of the wiring. I've done some reading and many have this same problem, and many are using ob2 engine harness.

The distributor is obd2

engine, harness, and distributor are from an 00 gsr.

all into my 95 LS shell on the p72 obd1 ecu. the harness inside the vehicle is obd1, like i had said just the engine wires are from the 00 gsr.

If i can find the wire on the distributor for the tach, I may try this method and see how it works.

[IshbOO]

I have just received this email form someone on honda-tech he cant explain good. but I'm thinking I'll try this.

"alright on the disturburter their is a thick blue wire ur gonna see 2 blue wires but the thicker one is the tach signal wire u wanna splice that wire and run a new wire 2 were u plug in the 2 plugs on the driver side know when u look down by the clutch resivor their will be a single wire ther i believe it blue with a silver strip not certain but i know it blue for sure it runs into nuthing it just sitten their it has like a big cap on it either black or clear cap with a blue wire leading into it but that the tach wire"

lol