have a couple prob after the ls1 swap into my 89 sw scb

[Chevy-Art]

the temp reading will be way off using the 98 sending unit. Tried and failed.

How far off is it?

[RedHeartbeat]

far enough off that you'll think the engine is fine when you're really seriously overheated.

[Chevy-Art]

I thought using the 98 sending unit was the preferred method. I guess I will have to use my trucks original sending unit.

[RedHeartbeat]

The last conversion I did, I put the stock water temp sensor in the water pump behind the factory tensioner.

[Chevy-Art]

The last conversion I did, I put the stock water temp sensor in the water pump behind the factory tensioner.

Did you just drill and tap it? Or did you use a heli-coil?

[RedHeartbeat]

took the pump off and then drilled and tapped.

[Chevy-Art]

took the pump off and then drilled and tapped.

What size tap?

[RedHeartbeat]

3/8 Npt

[Jgoodfella069]

I just took the plug out of the passenger side head and put in another sensor and ran one to the OBS harness and the other to give signal to the OBDII computer. If you wanted, use OBS sensor with adapter in passenger side head. Saves R&R and machining the water pump.

[88stepside]

ok so we have finished up the swap with the 5.3 ls based motor into my 89 gmc single cab short wheel base
deff was a learning experience lol
but i still have not figured out how to get my stock spedo, water temp, or gas level gauge has anyone elso had this problem??
any ifo that can help me out would be greatly appreciated
as of right now im using the spedo on my radar and have a aftermarket water temp gauge in the truck but i would like for the stock gauges to work as i do like them very much
thanks
Cody

What trans are you using? 88-90? trucks have "DRAC" built into speedo cluster. Therefore the cluster is looking for 2000ppm from VSS. Hope this helps.