I swapped the 13B into my car from another and am now just getting back to working on the car. The speedo, tach, and water temp no longer work, though they did before the swap. I imagine that I pulled the speedo cable out of the back, as I remember the cable's always been pretty tight. While doing the swap, I had to disconnect the ECU in the passenger footwell to engage the fuel pump. Would that have anything to do with my tach or water temp? The donor car only had 5 wires in the engine bay, so for now I have a full harness, most of which doesn't go anywhere. I suspect that the water temp gauge wires plug in behind the t'stat, but need to check. Any idea why the tach wouldn't work?

This ported 13B FB is gonna be my daily driver, with the 2 as a backup. I know the carb's too big, but the Dellorto 48 should work better. I just hate driving without proper instrumentation. Any help?

P.S. I'm pretty paranoid about overheating the FB and have a fan that overlaps the oil cooler a bit. Should I also go to a 165 t'stat w/ no cats?

 

The tach isn't working because the wire to the leading or trailing (not sure) came off but that's impossible if you just changed a motor... unless it wasn't working before the swap or you played with anything on the drivers side engine bay electrical wise... cause swapping a motor shouldn't requiring messing with the tach at all unless you re-did the ignition also while swapping the motor... are you following this...?

The speedo can ONLY not be working if the cable from behind it is not HOOKED up to the transmission NO electricial to make that work, unless you want it to be light up at night.

This is a first gen right...?

 

Yeah, I'm pretty sure that the speedo came loose from the back side of the gauge while I was plugging the other side in. Mine's always been very unforgiving - no slack. The tach, then, is driven strictly by the trailing coil? You're right in that I never touched it - maybe something's been knocked loose. How 'bout the coolant temp? The sensor for that is the one that's on the back side of the t'stat, right?

 

right. As for the rest, take a good look at the wiring diagrams, and go through the wires in question with an ohmmeter. Like 85TIIDevil said, unless you messed with the wiring on the driver's side of the car, the tach should work. The water temp sensor, on the other hand connects to the engine from the passenger's side, through connector X-08

 

Stupid question.....


Did you check your fuses? Let's start with the basics first.

 

Okay, so I'm behind the dash now trying to get the speedo hooked up. I could swear the cable's shrunk 3 inches... My question is with the t'stat sensor - I remember seeing people say that it's the open/close switch that releases the choke. Are those two mechanisms separate or do they both sense that one part, or what? As for the tach, all the fuses are good and no visible problem in the wiring. I'll get the other two working and see if magic happens.
'

 

All the gauge senders are on the factory harness from the DRIVERS side. None come from the Passengers side (at least on my SE)

 

the water temp sensor is on the motor below or next to the oil pressure sensor not in the water pump housing, the one in the water pump housing is for the ecu

 

okay, so i'm testing the sender and looking for a resistance between the nipple on the sender and the block. I should see a resistance that changes as the engine warms up, right? Maybe it's all the grime, oil, and tough access to the sender, but I can only get an open circuit on both the 13B in the car and the 12A that just came out of it (so I know the sender should work)